{"id":784,"date":"2023-04-11T20:19:52","date_gmt":"2023-04-11T11:19:52","guid":{"rendered":"http:\/\/edu.ujhb.org\/?p=784"},"modified":"2023-04-11T20:19:52","modified_gmt":"2023-04-11T11:19:52","slug":"sql%e5%85%a5%e9%97%a8%ef%bc%88%e4%b8%ad%e6%96%87%e7%89%88%ef%bc%89","status":"publish","type":"post","link":"https:\/\/edu.ujhb.org\/?p=784","title":{"rendered":"SQL\u5165\u95e8\uff08\u4e2d\u6587\u7248\uff09"},"content":{"rendered":"\n<p>\u6211\u662f\u8981\u505aIT\u6559\u7a0b\u7684\u89c6\u9891\uff0c\u4f60\u80fd\u5426\u6839\u636e\u7f51\u7ad9\u7684\u5185\u5bb9\uff0c\u4e3a\u6211\u5b89\u6392\u89c6\u9891\u6559\u7a0b\u7684\u6587\u5b57\u5185\u5bb9\u3002\u6211\u4eec\u5148\u4eceSQL\u6559\u7a0b\u5f00\u59cb\uff0c\u4f60\u5148\u4e3a\u6211\u5217\u51fa\u8981\u8bb2\u89e3\u7684\u5185\u5bb9\u4e00\u89c8\u3002<\/p>\n\n\n\n<p>\u5f53\u7136\uff0c\u6211\u53ef\u4ee5\u5e2e\u52a9\u60a8\u5b89\u6392SQL\u6559\u7a0b\u7684\u6587\u5b57\u5185\u5bb9\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u57fa\u672c\u7684\u4e3b\u9898\u548c\u8981\u70b9\uff0c\u60a8\u53ef\u4ee5\u6839\u636e\u60a8\u7684\u9700\u6c42\u548c\u76ee\u6807\u8fdb\u884c\u6269\u5c55\u548c\u8c03\u6574\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>SQL\u57fa\u7840\u77e5\u8bc6<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SQL\u7684\u5b9a\u4e49\u548c\u5386\u53f2<\/li>\n\n\n\n<li>SQL\u7684\u5206\u7c7b\u548c\u5e94\u7528\u9886\u57df<\/li>\n\n\n\n<li>SQL\u6807\u51c6\u548c\u5404\u79cd\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08DBMS\uff09\u7684\u5dee\u5f02<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>SQL\u6570\u636e\u7c7b\u578b<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6570\u503c\u7c7b\u578b<\/li>\n\n\n\n<li>\u5b57\u7b26\u4e32\u7c7b\u578b<\/li>\n\n\n\n<li>\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b<\/li>\n\n\n\n<li>\u5e03\u5c14\u7c7b\u578b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>SQL\u6570\u636e\u67e5\u8be2<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SELECT\u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5<\/li>\n\n\n\n<li>WHERE\u5b50\u53e5\u7684\u4f7f\u7528<\/li>\n\n\n\n<li>ORDER BY\u5b50\u53e5\u7684\u4f7f\u7528<\/li>\n\n\n\n<li>LIMIT\u5b50\u53e5\u7684\u4f7f\u7528<\/li>\n\n\n\n<li>GROUP BY\u5b50\u53e5\u7684\u4f7f\u7528<\/li>\n\n\n\n<li>HAVING\u5b50\u53e5\u7684\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\" start=\"4\">\n<li>SQL\u6570\u636e\u66f4\u65b0<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>INSERT\u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5<\/li>\n\n\n\n<li>UPDATE\u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5<\/li>\n\n\n\n<li>DELETE\u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\" start=\"5\">\n<li>SQL\u8868\u8bbe\u8ba1<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6570\u636e\u5e93\u8303\u5f0f\u7684\u6982\u5ff5<\/li>\n\n\n\n<li>\u57fa\u672c\u8bbe\u8ba1\u539f\u5219<\/li>\n\n\n\n<li>\u4e3b\u952e\u3001\u5916\u952e\u548c\u7d22\u5f15\u7684\u4f7f\u7528<\/li>\n\n\n\n<li>\u89c6\u56fe\u7684\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\" start=\"6\">\n<li>SQL\u9ad8\u7ea7\u8bdd\u9898<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b50\u67e5\u8be2\u7684\u4f7f\u7528<\/li>\n\n\n\n<li>\u8fde\u63a5\uff08JOIN\uff09\u7684\u4f7f\u7528<\/li>\n\n\n\n<li>\u805a\u5408\u51fd\u6570\u7684\u4f7f\u7528<\/li>\n\n\n\n<li>\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u7684\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<p>\u5e0c\u671b\u8fd9\u4e2a\u6e05\u5355\u53ef\u4ee5\u5e2e\u52a9\u60a8\u5236\u5b9a\u4e00\u4e2a\u5168\u9762\u7684SQL\u6559\u7a0b\u8ba1\u5212\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u63cf\u8ff0SQL\u7684\u5b9a\u4e49\u548c\u5386\u53f2<\/p>\n\n\n\n<p>SQL\uff08Structured Query Language\uff09\u662f\u4e00\u79cd\u7528\u4e8e\u7ba1\u7406\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u6807\u51c6\u5316\u8bed\u8a00\u3002\u5b83\u7531\u7f8e\u56fd\u56fd\u5bb6\u6807\u51c6\u534f\u4f1a\uff08ANSI\uff09\u548c\u56fd\u9645\u6807\u51c6\u7ec4\u7ec7\uff08ISO\uff09\u5b9a\u4e49\u548c\u7ef4\u62a4\uff0c\u662f\u6700\u5e38\u7528\u7684\u6570\u636e\u5e93\u7ba1\u7406\u8bed\u8a00\u4e4b\u4e00\u3002<\/p>\n\n\n\n<p>SQL\u7684\u5386\u53f2\u53ef\u4ee5\u8ffd\u6eaf\u5230\u4e0a\u4e16\u7eaa70\u5e74\u4ee3\u3002\u5728\u90a3\u4e2a\u65f6\u4ee3\uff0cIBM\u7684\u7814\u7a76\u5458Edgar F. Codd\u63d0\u51fa\u4e86\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u6982\u5ff5\uff0c\u5e76\u57281970\u5e74\u53d1\u8868\u4e86\u4e00\u7bc7\u8bba\u6587\uff0c\u8be6\u7ec6\u63cf\u8ff0\u4e86\u5173\u7cfb\u578b\u6570\u636e\u5e93\u6a21\u578b\u7684\u7406\u8bba\u57fa\u7840\u3002\u5728\u63a5\u4e0b\u6765\u7684\u51e0\u5e74\u4e2d\uff0c\u591a\u4e2a\u516c\u53f8\u548c\u7814\u7a76\u673a\u6784\u5f00\u59cb\u7814\u7a76\u548c\u5f00\u53d1\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08RDBMS\uff09\u3002<\/p>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u5404\u79cd\u4e0d\u540c\u7684\u6570\u636e\u67e5\u8be2\u8bed\u8a00\u5f97\u5230\u4e86\u53d1\u5c55\u548c\u4f7f\u7528\uff0c\u5305\u62ecIBM\u7684QUEL\u548cSQL\/DS\uff0c\u4ee5\u53ca\u82f1\u56fd\u4f26\u6566\u5927\u5b66\u7684Ingres\u548cSQL Databus\u7b49\u3002\u8fd9\u4e9b\u8bed\u8a00\u5404\u81ea\u6709\u4e0d\u540c\u7684\u7279\u70b9\u548c\u8bed\u6cd5\uff0c\u4f46\u5b83\u4eec\u7684\u57fa\u672c\u76ee\u6807\u90fd\u662f\u63d0\u4f9b\u4e00\u79cd\u6807\u51c6\u7684\u3001\u53ef\u9760\u7684\u3001\u9ad8\u6548\u7684\u65b9\u6cd5\u6765\u7ba1\u7406\u548c\u67e5\u8be2\u5173\u7cfb\u578b\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u79cd\u8bed\u8a00\u591a\u6837\u6027\u548c\u7f3a\u4e4f\u6807\u51c6\u5316\u7684\u95ee\u9898\uff0cANSI\u57281986\u5e74\u5236\u5b9a\u4e86\u7b2c\u4e00\u4e2aSQL\u6807\u51c6\u3002\u8fd9\u4e2a\u6807\u51c6\u57fa\u4e8eIBM\u7684SQL\/DS\u7cfb\u7edf\uff0c\u5e76\u5305\u62ec\u4e86\u591a\u79cd\u6570\u636e\u7c7b\u578b\u3001\u67e5\u8be2\u8bed\u53e5\u3001\u6570\u636e\u66f4\u65b0\u3001\u4e8b\u52a1\u5904\u7406\u548c\u5b89\u5168\u6027\u7b49\u65b9\u9762\u7684\u89c4\u8303\u3002\u63a5\u4e0b\u6765\u7684\u51e0\u5e74\u4e2d\uff0cISO\u548cANSI\u5206\u522b\u53d1\u5e03\u4e86\u591a\u4e2aSQL\u6807\u51c6\u7684\u7248\u672c\uff0c\u4f7fSQL\u6210\u4e3a\u4e00\u79cd\u88ab\u5e7f\u6cdb\u63a5\u53d7\u7684\u3001\u901a\u7528\u7684\u6570\u636e\u5e93\u7ba1\u7406\u8bed\u8a00\u3002<\/p>\n\n\n\n<p>\u4eca\u5929\uff0c\u51e0\u4e4e\u6240\u6709\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u90fd\u652f\u6301SQL\u8bed\u8a00\uff0c\u5305\u62ecOracle\u3001MySQL\u3001PostgreSQL\u3001Microsoft SQL Server\u548cSQLite\u7b49\u3002SQL\u7684\u6807\u51c6\u5316\u4f7f\u5f97\u5b83\u6210\u4e3a\u4e00\u4e2a\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u8ba9\u5f00\u53d1\u8005\u548c\u7ba1\u7406\u5458\u8f7b\u677e\u5730\u7ba1\u7406\u548c\u67e5\u8be2\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\uff0c\u4ece\u800c\u5b9e\u73b0\u66f4\u52a0\u9ad8\u6548\u3001\u53ef\u9760\u548c\u5b89\u5168\u7684\u6570\u636e\u7ba1\u7406\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u63cf\u8ff0SQL\u6807\u51c6\u548c\u5404\u79cd\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08DBMS\uff09\u7684\u5dee\u5f02<\/p>\n\n\n\n<p>\u867d\u7136SQL\u662f\u4e00\u79cd\u6807\u51c6\u5316\u7684\u6570\u636e\u5e93\u7ba1\u7406\u8bed\u8a00\uff0c\u4f46\u662f\u5404\u79cd\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08DBMS\uff09\u4e4b\u95f4\u4ecd\u7136\u5b58\u5728\u5dee\u5f02\u3002\u8fd9\u4e9b\u5dee\u5f02\u4e3b\u8981\u6765\u81ea\u4e24\u4e2a\u65b9\u9762\uff1aSQL\u6807\u51c6\u7684\u5b9e\u73b0\u548cDBMS\u7684\u529f\u80fd\u6269\u5c55\u3002<\/p>\n\n\n\n<p>SQL\u6807\u51c6\u7684\u5b9e\u73b0\u5dee\u5f02\uff1a \u5c3d\u7ba1SQL\u6807\u51c6\u5df2\u7ecf\u5f97\u5230\u4e86ISO\u548cANSI\u7b49\u7ec4\u7ec7\u7684\u5236\u5b9a\u548c\u7ef4\u62a4\uff0c\u4f46\u5404\u79cdDBMS\u5382\u5546\u5b9e\u73b0\u8fd9\u4e9b\u6807\u51c6\u7684\u65b9\u5f0f\u4e0d\u540c\u3002\u8fd9\u53ef\u80fd\u5bfc\u81f4\u4e0d\u540c\u7684DBMS\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u6267\u884c\u76f8\u540c\u7684SQL\u8bed\u53e5\u65f6\uff0c\u5f97\u5230\u7684\u7ed3\u679c\u4e5f\u4f1a\u4e0d\u540c\u3002\u4f8b\u5982\uff0c\u67d0\u4e9bDBMS\u53ef\u80fd\u4e0d\u652f\u6301\u67d0\u4e9bSQL\u6807\u51c6\u4e2d\u89c4\u5b9a\u7684\u8bed\u53e5\u6216\u51fd\u6570\uff0c\u6216\u8005\u652f\u6301\u7684\u8bed\u53e5\u548c\u51fd\u6570\u7684\u8bed\u6cd5\u6709\u6240\u4e0d\u540c\u3002<\/p>\n\n\n\n<p>DBMS\u7684\u529f\u80fd\u6269\u5c55\u5dee\u5f02\uff1a \u5c3d\u7ba1SQL\u662f\u4e00\u4e2a\u901a\u7528\u7684\u6570\u636e\u5e93\u7ba1\u7406\u8bed\u8a00\uff0c\u4f46\u4e0d\u540c\u7684DBMS\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u7279\u5b9a\u7684\u529f\u80fd\u6269\u5c55\u6765\u6ee1\u8db3\u7279\u5b9a\u7684\u9700\u6c42\u3002\u8fd9\u4e9b\u6269\u5c55\u53ef\u4ee5\u5305\u62ec\u4e13\u95e8\u7684\u51fd\u6570\u3001\u5b58\u50a8\u8fc7\u7a0b\u3001\u89e6\u53d1\u5668\u548c\u7d22\u5f15\u7c7b\u578b\u7b49\u3002\u8fd9\u4e9b\u6269\u5c55\u53ef\u4ee5\u6781\u5927\u5730\u589e\u5f3aDBMS\u7684\u529f\u80fd\uff0c\u4f46\u5b83\u4eec\u4e5f\u4f1a\u4f7f\u5f97\u4f7f\u7528\u4e0d\u540c\u7684DBMS\u4e4b\u95f4\u8fdb\u884c\u6570\u636e\u8f6c\u79fb\u548c\u8fc1\u79fb\u66f4\u52a0\u56f0\u96be\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u5c3d\u7ba1SQL\u6807\u51c6\u7684\u5b58\u5728\uff0c\u4f46\u4e0d\u540c\u7684DBMS\u4e4b\u95f4\u4ecd\u7136\u5b58\u5728\u5dee\u5f02\u3002\u4e86\u89e3\u8fd9\u4e9b\u5dee\u5f02\u5e76\u9009\u62e9\u6700\u9002\u5408\u81ea\u5df1\u7684DBMS\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u56e0\u4e3a\u8fd9\u5c06\u6709\u52a9\u4e8e\u5b9e\u73b0\u66f4\u9ad8\u6548\u3001\u66f4\u53ef\u9760\u548c\u66f4\u5b89\u5168\u7684\u6570\u636e\u7ba1\u7406\u3002\u540c\u65f6\uff0c\u7f16\u5199\u901a\u7528\u7684SQL\u8bed\u53e5\u5e76\u907f\u514d\u4f9d\u8d56\u4e8e\u7279\u5b9aDBMS\u7684\u6269\u5c55\uff0c\u4e5f\u53ef\u4ee5\u5e2e\u52a9\u6700\u5927\u9650\u5ea6\u5730\u51cf\u5c11DBMS\u4e4b\u95f4\u7684\u5dee\u5f02\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u7684\u5206\u7c7b\u548c\u5e94\u7528\u9886\u57df<\/p>\n\n\n\n<p>SQL\u53ef\u4ee5\u6839\u636e\u5176\u7528\u9014\u548c\u6267\u884c\u65b9\u5f0f\u8fdb\u884c\u5206\u7c7b\u3002\u6839\u636e\u7528\u9014\uff0cSQL\u53ef\u4ee5\u5206\u4e3a\u4ee5\u4e0b\u4e09\u79cd\u7c7b\u578b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6570\u636e\u5b9a\u4e49\u8bed\u8a00\uff08DDL\uff09\uff1aDDL\u662f\u7528\u4e8e\u521b\u5efa\u3001\u4fee\u6539\u548c\u5220\u9664\u6570\u636e\u5e93\u5bf9\u8c61\u7684SQL\u8bed\u53e5\u3002\u8fd9\u4e9b\u5bf9\u8c61\u5305\u62ec\u8868\u3001\u89c6\u56fe\u3001\u7d22\u5f15\u3001\u7ea6\u675f\u7b49\u3002\u5e38\u89c1\u7684DDL\u8bed\u53e5\u5305\u62ecCREATE\u3001ALTER\u548cDROP\u7b49\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u64cd\u4f5c\u8bed\u8a00\uff08DML\uff09\uff1aDML\u662f\u7528\u4e8e\u7ba1\u7406\u6570\u636e\u5e93\u4e2d\u5b58\u50a8\u7684\u6570\u636e\u7684SQL\u8bed\u53e5\u3002\u8fd9\u4e9b\u8bed\u53e5\u53ef\u4ee5\u7528\u4e8e\u63d2\u5165\u3001\u66f4\u65b0\u548c\u5220\u9664\u6570\u636e\uff0c\u4ee5\u53ca\u67e5\u8be2\u6570\u636e\u5e76\u8fd4\u56de\u7ed3\u679c\u3002\u5e38\u89c1\u7684DML\u8bed\u53e5\u5305\u62ecSELECT\u3001INSERT\u3001UPDATE\u548cDELETE\u7b49\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u63a7\u5236\u8bed\u8a00\uff08DCL\uff09\uff1aDCL\u662f\u7528\u4e8e\u7ba1\u7406\u6570\u636e\u5e93\u7528\u6237\u8bbf\u95ee\u6743\u9650\u548c\u4e8b\u52a1\u5904\u7406\u7684SQL\u8bed\u53e5\u3002\u8fd9\u4e9b\u8bed\u53e5\u5305\u62ecGRANT\u3001REVOKE\u548cCOMMIT\u7b49\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u6839\u636e\u6267\u884c\u65b9\u5f0f\uff0cSQL\u53ef\u4ee5\u5206\u4e3a\u4ee5\u4e0b\u4e24\u79cd\u7c7b\u578b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6279\u5904\u7406SQL\uff1a\u6279\u5904\u7406SQL\u662f\u4e00\u6b21\u6027\u53d1\u9001\u4e00\u7ec4SQL\u8bed\u53e5\u7684\u65b9\u5f0f\uff0c\u4e00\u6b21\u6027\u6267\u884c\u591a\u4e2a\u64cd\u4f5c\u3002\u8fd9\u79cd\u65b9\u5f0f\u9002\u5408\u4e8e\u6279\u91cf\u6570\u636e\u5904\u7406\u3001\u6570\u636e\u5e93\u5907\u4efd\u548c\u8fd8\u539f\u7b49\u4efb\u52a1\u3002<\/li>\n\n\n\n<li>\u4ea4\u4e92\u5f0fSQL\uff1a\u4ea4\u4e92\u5f0fSQL\u662f\u4e00\u79cd\u9010\u6761\u53d1\u9001SQL\u8bed\u53e5\u5e76\u7b49\u5f85\u6bcf\u4e2a\u8bed\u53e5\u7684\u6267\u884c\u7ed3\u679c\u7684\u65b9\u5f0f\u3002\u8fd9\u79cd\u65b9\u5f0f\u9002\u5408\u4e8e\u6570\u636e\u67e5\u8be2\u3001\u5355\u6761\u8bb0\u5f55\u63d2\u5165\u548c\u66f4\u65b0\u7b49\u4efb\u52a1\u3002<\/li>\n<\/ol>\n\n\n\n<p>SQL\u7684\u5e94\u7528\u9886\u57df\u975e\u5e38\u5e7f\u6cdb\uff0c\u51e0\u4e4e\u6240\u6709\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u90fd\u652f\u6301SQL\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9bSQL\u7684\u5e94\u7528\u9886\u57df\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6570\u636e\u5e93\u7ba1\u7406\uff1aSQL\u662f\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u7684\u6838\u5fc3\u8bed\u8a00\uff0c\u7528\u4e8e\u521b\u5efa\u3001\u4fee\u6539\u3001\u5220\u9664\u548c\u67e5\u8be2\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u548c\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u5206\u6790\uff1aSQL\u53ef\u4ee5\u7528\u4e8e\u67e5\u8be2\u548c\u5904\u7406\u5927\u91cf\u7684\u6570\u636e\uff0c\u5e2e\u52a9\u6570\u636e\u5206\u6790\u5e08\u548c\u4e1a\u52a1\u7528\u6237\u5feb\u901f\u83b7\u53d6\u6240\u9700\u7684\u6570\u636e\uff0c\u4ee5\u4fbf\u505a\u51fa\u6b63\u786e\u7684\u5546\u4e1a\u51b3\u7b56\u3002<\/li>\n\n\n\n<li>Web\u5f00\u53d1\uff1aSQL\u53ef\u4ee5\u901a\u8fc7Web\u5e94\u7528\u7a0b\u5e8f\u4ece\u6570\u636e\u5e93\u4e2d\u68c0\u7d22\u548c\u4fdd\u5b58\u6570\u636e\uff0c\u4f8b\u5982\u7535\u5b50\u5546\u52a1\u7f51\u7ad9\u3001\u793e\u4ea4\u5a92\u4f53\u548c\u5728\u7ebf\u8bba\u575b\u7b49\u3002<\/li>\n\n\n\n<li>\u79fb\u52a8\u5e94\u7528\uff1aSQL\u53ef\u4ee5\u901a\u8fc7\u79fb\u52a8\u5e94\u7528\u7a0b\u5e8f\u4e0e\u6570\u636e\u5e93\u4ea4\u4e92\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u6784\u5efa\u529f\u80fd\u5f3a\u5927\u7684\u79fb\u52a8\u5e94\u7528\u3002<\/li>\n\n\n\n<li>\u4eba\u5de5\u667a\u80fd\uff1aSQL\u53ef\u4ee5\u7528\u4e8e\u4ece\u5927\u578b\u6570\u636e\u96c6\u4e2d\u63d0\u53d6\u6709\u7528\u7684\u4fe1\u606f\uff0c\u8fd9\u662f\u8bad\u7ec3\u548c\u6d4b\u8bd5\u673a\u5668\u5b66\u4e60\u6a21\u578b\u7684\u5fc5\u8981\u6b65\u9aa4\u3002<\/li>\n<\/ol>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u6570\u503c\u7c7b\u578b<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0c\u6570\u503c\u7c7b\u578b\u7528\u4e8e\u8868\u793a\u6570\u503c\u6570\u636e\uff0c\u5e76\u5141\u8bb8\u8fdb\u884c\u57fa\u672c\u7684\u6570\u5b66\u8fd0\u7b97\u548c\u6bd4\u8f83\u3002SQL\u652f\u6301\u5404\u79cd\u6570\u503c\u7c7b\u578b\uff0c\u6bcf\u4e2a\u7c7b\u578b\u90fd\u5177\u6709\u5176\u81ea\u5df1\u7684\u5927\u5c0f\u8303\u56f4\u548c\u7cbe\u5ea6\u7ea7\u522b\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662fSQL\u4e2d\u5e38\u7528\u7684\u6570\u503c\u7c7b\u578b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6574\u578b\uff08INTEGER\u6216INT\uff09\uff1a\u6574\u578b\u7528\u4e8e\u5b58\u50a8\u6574\u6570\u503c\uff0c\u901a\u5e38\u6709\u4e0d\u540c\u7684\u5927\u5c0f\u548c\u8303\u56f4\u3002\u5728SQL\u4e2d\uff0cINT\u7c7b\u578b\u901a\u5e38\u4f7f\u75284\u5b57\u8282\uff0832\u4f4d\uff09\u5b58\u50a8\uff0c\u53ef\u4ee5\u5b58\u50a8\u4ece-2147483648\u52302147483647\u4e4b\u95f4\u7684\u503c\u3002\u5728\u4e00\u4e9bDBMS\u4e2d\uff0c\u8fd8\u6709\u66f4\u5c0f\u7684\u6574\u578b\u7c7b\u578b\uff0c\u5982TINYINT\u548cSMALLINT\uff0c\u5b83\u4eec\u5206\u522b\u4f7f\u75281\u5b57\u8282\u548c2\u5b57\u8282\u5b58\u50a8\u3002<\/li>\n\n\n\n<li>\u5c0f\u6570\u578b\uff08DECIMAL\u6216NUMERIC\uff09\uff1a\u5c0f\u6570\u578b\u7528\u4e8e\u5b58\u50a8\u5c0f\u6570\u503c\u3002\u5728SQL\u4e2d\uff0cDECIMAL\u7c7b\u578b\u7684\u7cbe\u5ea6\u662f\u56fa\u5b9a\u7684\uff0c\u5b83\u6307\u5b9a\u4e86\u5c0f\u6570\u70b9\u53f3\u4fa7\u7684\u4f4d\u6570\uff0c\u800cNUMERIC\u7c7b\u578b\u7684\u7cbe\u5ea6\u662f\u53ef\u53d8\u7684\uff0c\u5b83\u6307\u5b9a\u4e86\u603b\u5171\u7684\u4f4d\u6570\u3002\u4f8b\u5982\uff0cDECIMAL(10,2)\u53ef\u4ee5\u5b58\u50a810\u4f4d\u6570\u5b57\uff0c\u5176\u4e2d2\u4f4d\u662f\u5c0f\u6570\u90e8\u5206\uff0c\u800cNUMERIC(10,5)\u53ef\u4ee5\u5b58\u50a810\u4f4d\u6570\u5b57\uff0c\u5176\u4e2d5\u4f4d\u662f\u5c0f\u6570\u90e8\u5206\u3002<\/li>\n\n\n\n<li>\u6d6e\u70b9\u578b\uff08FLOAT\u6216DOUBLE\uff09\uff1a\u6d6e\u70b9\u578b\u7528\u4e8e\u5b58\u50a8\u6d6e\u70b9\u6570\u503c\uff0c\u5176\u7cbe\u5ea6\u548c\u8303\u56f4\u90fd\u6bd4DECIMAL\u7c7b\u578b\u66f4\u9ad8\u3002\u5728SQL\u4e2d\uff0cFLOAT\u7c7b\u578b\u901a\u5e38\u4f7f\u75284\u5b57\u8282\uff0832\u4f4d\uff09\u62168\u5b57\u8282\uff0864\u4f4d\uff09\u5b58\u50a8\uff0c\u53ef\u4ee5\u5b58\u50a8\u4ece-3.4E38\u52303.4E38\u4e4b\u95f4\u7684\u503c\u3002DOUBLE\u7c7b\u578b\u901a\u5e38\u4f7f\u75288\u5b57\u8282\uff0864\u4f4d\uff09\u5b58\u50a8\uff0c\u53ef\u4ee5\u5b58\u50a8\u66f4\u5927\u7684\u6570\u503c\u8303\u56f4\u3002<\/li>\n\n\n\n<li>\u4f4d\u7c7b\u578b\uff08BIT\u6216BOOLEAN\uff09\uff1a\u4f4d\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u4e8c\u8fdb\u5236\u4f4d\u6570\u636e\u6216\u5e03\u5c14\u503c\u3002BIT\u7c7b\u578b\u53ef\u4ee5\u5b58\u50a81\u62160\uff0c\u6216\u4e00\u7cfb\u5217\u4e8c\u8fdb\u5236\u4f4d\uff0c\u800cBOOLEAN\u7c7b\u578b\u53ef\u4ee5\u5b58\u50a8TRUE\u6216FALSE\u3002<\/li>\n\n\n\n<li>\u5e8f\u5217\u7c7b\u578b\uff08SERIAL\u6216IDENTITY\uff09\uff1a\u5e8f\u5217\u7c7b\u578b\u7528\u4e8e\u751f\u6210\u81ea\u52a8\u9012\u589e\u7684\u6574\u6570\u503c\uff0c\u901a\u5e38\u7528\u4e8e\u4e3a\u8868\u4e2d\u7684\u884c\u751f\u6210\u552f\u4e00\u7684\u6807\u8bc6\u7b26\u3002\u5728SQL\u4e2d\uff0cSERIAL\u7c7b\u578b\u53ef\u4ee5\u81ea\u52a8\u751f\u6210\u9012\u589e\u7684\u6574\u6570\u503c\uff0c\u800cIDENTITY\u7c7b\u578b\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u7c7b\u4f3c\u7684\u529f\u80fd\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u4f7f\u7528\u6b63\u786e\u7684\u6570\u503c\u7c7b\u578b\u5bf9\u4e8e\u786e\u4fdd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u7684\u6b63\u786e\u6027\u548c\u4e00\u81f4\u6027\u975e\u5e38\u91cd\u8981\u3002\u5728\u521b\u5efa\u8868\u65f6\uff0c\u5e94\u6839\u636e\u6570\u636e\u7684\u7c7b\u578b\u548c\u7cbe\u5ea6\u9009\u62e9\u6b63\u786e\u7684\u6570\u503c\u7c7b\u578b\uff0c\u5e76\u786e\u4fdd\u6570\u636e\u7684\u8303\u56f4\u548c\u7cbe\u5ea6\u4e0e\u5217\u5b9a\u4e49\u76f8\u5339\u914d\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u5b57\u7b26\u4e32\u7c7b\u578b<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0c\u5b57\u7b26\u4e32\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u6587\u672c\u6570\u636e\u3002SQL\u652f\u6301\u591a\u79cd\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u6bcf\u4e2a\u7c7b\u578b\u90fd\u6709\u5176\u81ea\u5df1\u7684\u7279\u70b9\u548c\u7528\u9014\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662fSQL\u4e2d\u5e38\u7528\u7684\u5b57\u7b26\u4e32\u7c7b\u578b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>CHAR\uff1aCHAR\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u56fa\u5b9a\u957f\u5ea6\u7684\u5b57\u7b26\u4e32\uff0c\u957f\u5ea6\u5728\u521b\u5efa\u8868\u65f6\u6307\u5b9a\u3002\u5982\u679c\u5b58\u50a8\u7684\u5b57\u7b26\u4e32\u957f\u5ea6\u4e0d\u8db3\u6307\u5b9a\u7684\u957f\u5ea6\uff0c\u5219\u7528\u7a7a\u683c\u8fdb\u884c\u586b\u5145\u3002\u4f8b\u5982\uff0c\u5982\u679c\u5c06\u4e00\u4e2a\u957f\u5ea6\u4e3a10\u7684CHAR\u7c7b\u578b\u5217\u5b9a\u4e49\u4e3a\u5b58\u50a8\u201cHello\u201d\u5b57\u7b26\u4e32\uff0c\u5219\u8be5\u5217\u5c06\u5b58\u50a8\u201cHello \u201d\uff08\u6ce8\u610f\u7a7a\u683c\uff09\u3002<\/li>\n\n\n\n<li>VARCHAR\uff1aVARCHAR\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u53ef\u53d8\u957f\u5ea6\u7684\u5b57\u7b26\u4e32\uff0c\u957f\u5ea6\u5728\u521b\u5efa\u8868\u65f6\u6307\u5b9a\u3002\u4e0eCHAR\u4e0d\u540c\uff0cVARCHAR\u53ea\u5b58\u50a8\u5b9e\u9645\u8f93\u5165\u7684\u5b57\u7b26\u4e32\uff0c\u4e0d\u4f1a\u7528\u7a7a\u683c\u8fdb\u884c\u586b\u5145\u3002\u4f8b\u5982\uff0c\u5982\u679c\u5c06\u4e00\u4e2a\u957f\u5ea6\u4e3a10\u7684VARCHAR\u7c7b\u578b\u5217\u5b9a\u4e49\u4e3a\u5b58\u50a8\u201cHello\u201d\u5b57\u7b26\u4e32\uff0c\u5219\u8be5\u5217\u5c06\u53ea\u5b58\u50a8\u201cHello\u201d\u3002<\/li>\n\n\n\n<li>TEXT\uff1aTEXT\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u8f83\u957f\u7684\u6587\u672c\u5b57\u7b26\u4e32\uff0c\u957f\u5ea6\u53ef\u4ee5\u8d85\u8fc7VARCHAR\u7c7b\u578b\u7684\u9650\u5236\u3002\u5b83\u901a\u5e38\u7528\u4e8e\u5b58\u50a8\u5927\u5757\u6587\u672c\u6570\u636e\uff0c\u5982\u6587\u7ae0\u6216\u8bc4\u8bba\u3002<\/li>\n\n\n\n<li>BLOB\uff1aBLOB\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u5982\u56fe\u50cf\u3001\u97f3\u9891\u6216\u89c6\u9891\u6587\u4ef6\u3002\u5b83\u901a\u5e38\u7528\u4e8e\u5b58\u50a8\u6587\u4ef6\u6216\u56fe\u50cf\u6570\u636e\u3002<\/li>\n\n\n\n<li>CLOB\uff1aCLOB\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u8f83\u957f\u7684\u5b57\u7b26\u6570\u636e\uff0c\u901a\u5e38\u7528\u4e8e\u5b58\u50a8\u6587\u6863\u6216\u5176\u4ed6\u5927\u578b\u6587\u672c\u6570\u636e\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u4f7f\u7528\u6b63\u786e\u7684\u5b57\u7b26\u4e32\u7c7b\u578b\u5bf9\u4e8e\u786e\u4fdd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u7684\u6b63\u786e\u6027\u548c\u4e00\u81f4\u6027\u975e\u5e38\u91cd\u8981\u3002\u5728\u521b\u5efa\u8868\u65f6\uff0c\u5e94\u6839\u636e\u5b58\u50a8\u7684\u6570\u636e\u7c7b\u578b\u548c\u957f\u5ea6\u9009\u62e9\u6b63\u786e\u7684\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u5e76\u786e\u4fdd\u6570\u636e\u7684\u957f\u5ea6\u4e0e\u5217\u5b9a\u4e49\u76f8\u5339\u914d\u3002\u6b64\u5916\uff0c\u5728\u67e5\u8be2\u4e2d\u4f7f\u7528\u5b57\u7b26\u4e32\u7c7b\u578b\u65f6\uff0c\u5e94\u683c\u5916\u6ce8\u610f\u5b57\u7b26\u4e32\u7684\u683c\u5f0f\u548c\u957f\u5ea6\uff0c\u4ee5\u907f\u514d\u51fa\u73b0\u610f\u5916\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0c\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u65e5\u671f\u548c\u65f6\u95f4\u4fe1\u606f\u3002SQL\u652f\u6301\u591a\u79cd\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b\uff0c\u6bcf\u4e2a\u7c7b\u578b\u90fd\u6709\u5176\u81ea\u5df1\u7684\u7279\u70b9\u548c\u7528\u9014\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662fSQL\u4e2d\u5e38\u7528\u7684\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>DATE\uff1aDATE\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u65e5\u671f\u503c\uff0c\u5305\u62ec\u5e74\u3001\u6708\u3001\u65e5\u3002\u65e5\u671f\u503c\u5fc5\u987b\u5728 &#8216;1000-01-01&#8217; \u548c &#8216;9999-12-31&#8242; \u4e4b\u95f4\u3002\u4f8b\u5982\uff0c&#8217;2022-04-04&#8217; \u662f\u4e00\u4e2aDATE\u7c7b\u578b\u7684\u503c\u3002<\/li>\n\n\n\n<li>TIME\uff1aTIME\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u65f6\u95f4\u503c\uff0c\u5305\u62ec\u5c0f\u65f6\u3001\u5206\u949f\u3001\u79d2\u548c\u6beb\u79d2\u3002\u65f6\u95f4\u503c\u5fc5\u987b\u5728 &#8217;00:00:00.000000&#8242; \u548c &#8217;23:59:59.999999&#8242; \u4e4b\u95f4\u3002\u4f8b\u5982\uff0c&#8217;14:30:00.000000&#8242; \u662f\u4e00\u4e2aTIME\u7c7b\u578b\u7684\u503c\u3002<\/li>\n\n\n\n<li>DATETIME\/TIMESTAMP\uff1aDATETIME\u548cTIMESTAMP\u7c7b\u578b\u90fd\u7528\u4e8e\u5b58\u50a8\u65e5\u671f\u548c\u65f6\u95f4\u503c\u3002\u5b83\u4eec\u5305\u62ec\u65e5\u671f\u548c\u65f6\u95f4\u4fe1\u606f\uff0c\u4f46\u5728\u5b58\u50a8\u548c\u8868\u793a\u65b9\u9762\u7565\u6709\u4e0d\u540c\u3002DATETIME\u7c7b\u578b\u4f7f\u7528\u56fa\u5b9a\u7684\u683c\u5f0f &#8216;YYYY-MM-DD HH:MM:SS&#8217;\uff0c\u800cTIMESTAMP\u7c7b\u578b\u53ef\u4ee5\u4f7f\u7528\u4e0d\u540c\u7684\u683c\u5f0f\uff08\u53d6\u51b3\u4e8e\u5177\u4f53\u7684DBMS\uff09\uff0c\u5b83\u53ef\u4ee5\u81ea\u52a8\u8f6c\u6362\u4e3a\u65e5\u671f\u548c\u65f6\u95f4\u503c\u3002\u4f8b\u5982\uff0c&#8217;2022-04-04 14:30:00&#8217; \u662f\u4e00\u4e2aDATETIME\u7c7b\u578b\u7684\u503c\uff0c\u800c &#8216;2022-04-04T14:30:00Z&#8217; \u662f\u4e00\u4e2aTIMESTAMP\u7c7b\u578b\u7684\u503c\u3002<\/li>\n\n\n\n<li>YEAR\uff1aYEAR\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u5e74\u4efd\u503c\u3002\u5b83\u53ef\u4ee5\u5b58\u50a82\u4f4d\u62164\u4f4d\u7684\u5e74\u4efd\u503c\uff08\u5982\u679c\u5b58\u50a8\u7684\u662f2\u4f4d\u5e74\u4efd\uff0c\u5219\u5728\u8f6c\u6362\u4e3a\u5177\u4f53\u5e74\u4efd\u65f6\uff0c\u4f1a\u4f7f\u7528\u7279\u5b9a\u7684\u89c4\u5219\uff09\u3002\u4f8b\u5982\uff0c&#8217;22&#8217; \u662f\u4e00\u4e2aYEAR\u7c7b\u578b\u7684\u503c\uff0c\u8868\u793a2022\u5e74\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u4f7f\u7528\u6b63\u786e\u7684\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b\u5bf9\u4e8e\u786e\u4fdd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u7684\u6b63\u786e\u6027\u548c\u4e00\u81f4\u6027\u975e\u5e38\u91cd\u8981\u3002\u5728\u521b\u5efa\u8868\u65f6\uff0c\u5e94\u6839\u636e\u5b58\u50a8\u7684\u6570\u636e\u7c7b\u578b\u548c\u683c\u5f0f\u9009\u62e9\u6b63\u786e\u7684\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b\uff0c\u5e76\u786e\u4fdd\u6570\u636e\u7684\u683c\u5f0f\u7b26\u5408\u5217\u5b9a\u4e49\u3002\u6b64\u5916\uff0c\u5728\u67e5\u8be2\u4e2d\u4f7f\u7528\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b\u65f6\uff0c\u5e94\u683c\u5916\u6ce8\u610f\u65f6\u95f4\u7684\u7cbe\u5ea6\u548c\u65f6\u533a\u95ee\u9898\uff0c\u4ee5\u907f\u514d\u51fa\u73b0\u610f\u5916\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u5e03\u5c14\u7c7b\u578b<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0c\u5e03\u5c14\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8\u5e03\u5c14\u503c\uff0c\u5373\u771f\uff08TRUE\uff09\u6216\u5047\uff08FALSE\uff09\u3002\u5e03\u5c14\u7c7b\u578b\u7684\u53d6\u503c\u53ea\u6709\u4e24\u79cd\uff0c\u53ef\u4ee5\u7528\u4e8e\u5b58\u50a8\u903b\u8f91\u771f\u503c\u3001\u771f\u5047\u6761\u4ef6\u7b49\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u5728\u5927\u591a\u6570DBMS\u4e2d\uff0c\u5e03\u5c14\u7c7b\u578b\u7528TINYINT\u6216BIT\u7c7b\u578b\u6765\u5b9e\u73b0\uff0c\u5176\u4e2d0\u4ee3\u8868\u5047\uff0c1\u4ee3\u8868\u771f\u3002\u4e00\u4e9bDBMS\u4e5f\u652f\u6301BOOLEAN\u7c7b\u578b\uff0c\u5b83\u662f\u4e00\u4e2a\u771f\u6b63\u7684\u5e03\u5c14\u7c7b\u578b\uff0c\u53ea\u80fd\u5b58\u50a8\u771f\u6216\u5047\u503c\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528\u5e03\u5c14\u7c7b\u578b\u53ef\u4ee5\u4f7fSQL\u67e5\u8be2\u66f4\u52a0\u76f4\u89c2\u548c\u7b80\u6d01\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528WHERE\u5b50\u53e5\u6765\u8fc7\u6ee4\u6ee1\u8db3\u67d0\u4e2a\u6761\u4ef6\u7684\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT * FROM employees WHERE is_active = TRUE;\n<\/code><\/pre>\n\n\n\n<p>\u5e03\u5c14\u7c7b\u578b\u8fd8\u53ef\u4ee5\u5728SELECT\u8bed\u53e5\u4e2d\u7528\u4f5c\u6761\u4ef6\uff0c\u4ee5\u4fbf\u6839\u636e\u7279\u5b9a\u7684\u5e03\u5c14\u503c\u9009\u62e9\u8981\u8fd4\u56de\u7684\u5217\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT name, age, is_active FROM employees WHERE is_active = TRUE;\n<\/code><\/pre>\n\n\n\n<p>\u5728\u521b\u5efa\u8868\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528BOOLEAN\u6216TINYINT\/BIT\u7c7b\u578b\u6765\u5b9a\u4e49\u5e03\u5c14\u5217\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u8bed\u53e5\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u5e03\u5c14\u5217\u7684employees\u8868\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>CREATE TABLE employees (\n  id INT PRIMARY KEY,\n  name VARCHAR(50),\n  age INT,\n  is_active BOOLEAN\n);\n<\/code><\/pre>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4e0d\u540c\u7684DBMS\u4e2d\uff0c\u5e03\u5c14\u7c7b\u578b\u7684\u8bed\u6cd5\u548c\u7528\u6cd5\u53ef\u80fd\u7565\u6709\u4e0d\u540c\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u6570\u636e\u67e5\u8be2SELECT\u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0cSELECT\u8bed\u53e5\u662f\u6700\u57fa\u672c\u548c\u6700\u5e38\u7528\u7684\u8bed\u53e5\u4e4b\u4e00\uff0c\u7528\u4e8e\u4ece\u4e00\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u9009\u62e9\u6570\u636e\u3002\u5b83\u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT column1, column2, ... FROM table_name;\n<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff0ccolumn1, column2, &#8230; \u662f\u8981\u9009\u62e9\u7684\u5217\u540d\uff0c\u53ef\u4ee5\u4f7f\u7528\u901a\u914d\u7b26\uff08*\uff09\u6765\u9009\u62e9\u6240\u6709\u5217\u3002table_name \u662f\u8981\u67e5\u8be2\u7684\u8868\u540d\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u7528\u4e8e\u4eceemployees\u8868\u4e2d\u9009\u62e9id\u548cname\u5217\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT id, name FROM employees;\n<\/code><\/pre>\n\n\n\n<p>\u9664\u4e86\u9009\u62e9\u5217\u4e4b\u5916\uff0cSELECT\u8bed\u53e5\u8fd8\u652f\u6301WHERE\u5b50\u53e5\u6765\u7b5b\u9009\u884c\uff0c\u4f7f\u7528ORDER BY\u5b50\u53e5\u5bf9\u7ed3\u679c\u8fdb\u884c\u6392\u5e8f\uff0c\u4f7f\u7528GROUP BY\u5b50\u53e5\u5c06\u7ed3\u679c\u6309\u7279\u5b9a\u5217\u8fdb\u884c\u5206\u7ec4\uff0c\u5e76\u4f7f\u7528\u805a\u5408\u51fd\u6570\u5bf9\u6570\u636e\u8fdb\u884c\u6c47\u603b\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662fSELECT\u8bed\u53e5\u7684\u4e00\u4e9b\u5e38\u89c1\u7528\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4f7f\u7528WHERE\u5b50\u53e5\u6765\u7b5b\u9009\u884c\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT id, name FROM employees WHERE age &gt; 30;\n<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>\u4f7f\u7528ORDER BY\u5b50\u53e5\u6309\u5217\u8fdb\u884c\u6392\u5e8f\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT id, name, age FROM employees ORDER BY age DESC;\n<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>\u4f7f\u7528GROUP BY\u5b50\u53e5\u5c06\u7ed3\u679c\u6309\u5217\u8fdb\u884c\u5206\u7ec4\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT department, COUNT(*) FROM employees GROUP BY department;\n<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"4\">\n<li>\u4f7f\u7528\u805a\u5408\u51fd\u6570\u5bf9\u6570\u636e\u8fdb\u884c\u6c47\u603b\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT AVG(salary) FROM employees;\n<\/code><\/pre>\n\n\n\n<p>SELECT\u8bed\u53e5\u8fd8\u652f\u6301\u4f7f\u7528JOIN\u64cd\u4f5c\u8fde\u63a5\u591a\u4e2a\u8868\uff0c\u4ee5\u4fbf\u4ece\u591a\u4e2a\u8868\u4e2d\u9009\u62e9\u548c\u7ec4\u5408\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4e0d\u540c\u7684DBMS\u4e2d\uff0cSELECT\u8bed\u53e5\u7684\u8bed\u6cd5\u548c\u7528\u6cd5\u53ef\u80fd\u7565\u6709\u4e0d\u540c\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u67e5\u8be2WHERE\u5b50\u53e5\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0cWHERE\u5b50\u53e5\u662fSELECT\u8bed\u53e5\u7684\u4e00\u4e2a\u91cd\u8981\u90e8\u5206\uff0c\u7528\u4e8e\u7b5b\u9009\u884c\u5e76\u8fd4\u56de\u7b26\u5408\u6761\u4ef6\u7684\u6570\u636e\u3002WHERE\u5b50\u53e5\u901a\u5e38\u4e0e\u6bd4\u8f83\u8fd0\u7b97\u7b26\u3001\u903b\u8f91\u8fd0\u7b97\u7b26\u548c\u901a\u914d\u7b26\u4e00\u8d77\u4f7f\u7528\uff0c\u53ef\u4ee5\u6839\u636e\u6307\u5b9a\u7684\u6761\u4ef6\u6765\u8fc7\u6ee4\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662fWHERE\u5b50\u53e5\u7684\u4e00\u4e9b\u5e38\u89c1\u7528\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4f7f\u7528\u6bd4\u8f83\u8fd0\u7b97\u7b26\u6765\u7b5b\u9009\u884c<\/li>\n<\/ol>\n\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff08\u5982=\u3001&gt;\u3001&lt;\u3001&gt;=\u3001&lt;=\u548c&lt;&gt;\uff09\u6765\u6bd4\u8f83\u5217\u503c\u4e0e\u6761\u4ef6\u503c\u3002\u4ee5\u4e0b\u793a\u4f8b\u4f7f\u7528WHERE\u5b50\u53e5\u6765\u9009\u62e9age\u5217\u5927\u4e8e30\u7684\u6240\u6709\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT id, name, age FROM employees WHERE age &gt; 30;\n<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26\u6765\u7b5b\u9009\u884c<\/li>\n<\/ol>\n\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528\u903b\u8f91\u8fd0\u7b97\u7b26\uff08\u5982AND\u3001OR\u548cNOT\uff09\u5c06\u591a\u4e2a\u6761\u4ef6\u7ec4\u5408\u8d77\u6765\u3002\u4ee5\u4e0b\u793a\u4f8b\u4f7f\u7528WHERE\u5b50\u53e5\u6765\u9009\u62e9age\u5217\u5927\u4e8e30\u5e76\u4e14department\u5217\u4e3a&#8221;Sales&#8221;\u7684\u6240\u6709\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT id, name, age, department FROM employees WHERE age &gt; 30 AND department = 'Sales';\n<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>\u4f7f\u7528\u901a\u914d\u7b26\u8fdb\u884c\u6a21\u7cca\u5339\u914d<\/li>\n<\/ol>\n\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528\u901a\u914d\u7b26\uff08\u5982%\u548c_\uff09\u6765\u8fdb\u884c\u6a21\u7cca\u5339\u914d\u3002%\u8868\u793a\u4efb\u610f\u5b57\u7b26\u5e8f\u5217\uff0c_\u8868\u793a\u4efb\u610f\u5355\u4e2a\u5b57\u7b26\u3002\u4ee5\u4e0b\u793a\u4f8b\u4f7f\u7528WHERE\u5b50\u53e5\u6765\u9009\u62e9name\u5217\u4ee5&#8221;J&#8221;\u5f00\u5934\u7684\u6240\u6709\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT id, name FROM employees WHERE name LIKE 'J%';\n<\/code><\/pre>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4f7f\u7528WHERE\u5b50\u53e5\u65f6\uff0c\u5e94\u8be5\u907f\u514d\u4f7f\u7528\u4e0d\u5fc5\u8981\u7684\u903b\u8f91\u8fd0\u7b97\u7b26\u548c\u901a\u914d\u7b26\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002\u53e6\u5916\uff0c\u5728\u4f7f\u7528\u6bd4\u8f83\u8fd0\u7b97\u7b26\u65f6\uff0c\u5e94\u8be5\u786e\u4fdd\u6bd4\u8f83\u7684\u6570\u636e\u7c7b\u578b\u76f8\u540c\uff0c\u4ee5\u514d\u51fa\u73b0\u9519\u8bef\u7ed3\u679c\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4e0d\u540c\u7684DBMS\u4e2d\uff0cWHERE\u5b50\u53e5\u7684\u8bed\u6cd5\u548c\u7528\u6cd5\u53ef\u80fd\u7565\u6709\u4e0d\u540c\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u67e5\u8be2ORDER BY\u5b50\u53e5\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0cORDER BY\u5b50\u53e5\u662fSELECT\u8bed\u53e5\u7684\u4e00\u4e2a\u53ef\u9009\u90e8\u5206\uff0c\u7528\u4e8e\u5bf9\u67e5\u8be2\u7ed3\u679c\u6309\u7167\u6307\u5b9a\u7684\u5217\u8fdb\u884c\u6392\u5e8f\u3002ORDER BY\u5b50\u53e5\u53ef\u4ee5\u6309\u5347\u5e8f\uff08ASC\uff09\u6216\u964d\u5e8f\uff08DESC\uff09\u6392\u5217\u67e5\u8be2\u7ed3\u679c\uff0c\u9ed8\u8ba4\u4e3a\u5347\u5e8f\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662fORDER BY\u5b50\u53e5\u7684\u4e00\u4e9b\u5e38\u89c1\u7528\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6309\u5355\u4e2a\u5217\u8fdb\u884c\u6392\u5e8f<\/li>\n<\/ol>\n\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528ORDER BY\u5b50\u53e5\u6309\u5355\u4e2a\u5217\u8fdb\u884c\u6392\u5e8f\u3002\u4ee5\u4e0b\u793a\u4f8b\u4f7f\u7528ORDER BY\u5b50\u53e5\u6309age\u5217\u964d\u5e8f\u6392\u5217\u67e5\u8be2\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT id, name, age FROM employees ORDER BY age DESC;\n<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>\u6309\u591a\u4e2a\u5217\u8fdb\u884c\u6392\u5e8f<\/li>\n<\/ol>\n\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528ORDER BY\u5b50\u53e5\u6309\u591a\u4e2a\u5217\u8fdb\u884c\u6392\u5e8f\u3002\u5728\u6307\u5b9a\u591a\u4e2a\u5217\u65f6\uff0c\u6309\u7167\u5217\u540d\u7684\u987a\u5e8f\u8fdb\u884c\u6392\u5e8f\u3002\u4ee5\u4e0b\u793a\u4f8b\u4f7f\u7528ORDER BY\u5b50\u53e5\u6309department\u5217\u5347\u5e8f\u6392\u5217\uff0c\u7136\u540e\u6309salary\u5217\u964d\u5e8f\u6392\u5217\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT id, name, department, salary FROM employees ORDER BY department ASC, salary DESC;\n<\/code><\/pre>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4f7f\u7528ORDER BY\u5b50\u53e5\u65f6\uff0c\u5e94\u8be5\u786e\u4fdd\u5217\u540d\u6b63\u786e\uff0c\u5e76\u4e14\u5217\u4e2d\u7684\u6570\u636e\u7c7b\u578b\u76f8\u540c\uff0c\u4ee5\u4fbf\u6b63\u786e\u6392\u5e8f\u3002<\/p>\n\n\n\n<p>\u53e6\u5916\uff0c\u5728\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\u65f6\uff0c\u4f7f\u7528ORDER BY\u5b50\u53e5\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u4f7f\u7528\u7d22\u5f15\u6216\u5176\u4ed6\u4f18\u5316\u6280\u672f\u6765\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6392\u5e8f\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4e0d\u540c\u7684DBMS\u4e2d\uff0cORDER BY\u5b50\u53e5\u7684\u8bed\u6cd5\u548c\u7528\u6cd5\u53ef\u80fd\u7565\u6709\u4e0d\u540c\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u67e5\u8be2LIMIT\u5b50\u53e5\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0cLIMIT\u5b50\u53e5\u662fSELECT\u8bed\u53e5\u7684\u4e00\u4e2a\u53ef\u9009\u90e8\u5206\uff0c\u7528\u4e8e\u9650\u5236\u67e5\u8be2\u7ed3\u679c\u7684\u6570\u91cf\u3002LIMIT\u5b50\u53e5\u901a\u5e38\u4e0eORDER BY\u5b50\u53e5\u4e00\u8d77\u4f7f\u7528\uff0c\u4ee5\u4fbf\u5728\u5bf9\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u6392\u5e8f\u540e\uff0c\u53ea\u8fd4\u56de\u524d\u51e0\u4e2a\u884c\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662fLIMIT\u5b50\u53e5\u7684\u4e00\u4e9b\u5e38\u89c1\u7528\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u8fd4\u56de\u524d\u51e0\u4e2a\u884c<\/li>\n<\/ol>\n\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528LIMIT\u5b50\u53e5\u8fd4\u56de\u524d\u51e0\u4e2a\u884c\u3002\u4ee5\u4e0b\u793a\u4f8b\u4f7f\u7528LIMIT\u5b50\u53e5\u8fd4\u56de\u524d5\u4e2a\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT id, name, age FROM employees LIMIT 5;\n<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>\u6307\u5b9a\u504f\u79fb\u91cf<\/li>\n<\/ol>\n\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528OFFSET\u5b50\u53e5\u6307\u5b9a\u4ece\u67e5\u8be2\u7ed3\u679c\u7684\u54ea\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u8fd4\u56de\u884c\u3002\u4ee5\u4e0b\u793a\u4f8b\u4f7f\u7528LIMIT\u548cOFFSET\u5b50\u53e5\u8fd4\u56de\u4ece\u7b2c6\u884c\u5f00\u59cb\u76845\u4e2a\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT id, name, age FROM employees LIMIT 5 OFFSET 5;\n<\/code><\/pre>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4e0d\u540c\u7684DBMS\u4e2d\uff0cLIMIT\u5b50\u53e5\u7684\u8bed\u6cd5\u548c\u7528\u6cd5\u53ef\u80fd\u7565\u6709\u4e0d\u540c\u3002\u4e00\u4e9bDBMS\u4f7f\u7528TOP\u5b50\u53e5\u6765\u9650\u5236\u67e5\u8be2\u7ed3\u679c\u7684\u6570\u91cf\uff0c\u800c\u4e0d\u662f\u4f7f\u7528LIMIT\u5b50\u53e5\u3002\u53e6\u5916\uff0c\u5728\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\u65f6\uff0c\u4f7f\u7528LIMIT\u5b50\u53e5\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u4f7f\u7528\u7d22\u5f15\u6216\u5176\u4ed6\u4f18\u5316\u6280\u672f\u6765\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u884c\u626b\u63cf\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u67e5\u8be2GROUP BY\u5b50\u53e5\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0cGROUP BY\u5b50\u53e5\u662fSELECT\u8bed\u53e5\u7684\u4e00\u4e2a\u53ef\u9009\u90e8\u5206\uff0c\u7528\u4e8e\u6309\u7167\u4e00\u4e2a\u6216\u591a\u4e2a\u5217\u5bf9\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u5206\u7ec4\u3002GROUP BY\u5b50\u53e5\u901a\u5e38\u4e0e\u805a\u5408\u51fd\u6570\uff08\u5982SUM\uff0cCOUNT\uff0cAVG\u7b49\uff09\u4e00\u8d77\u4f7f\u7528\uff0c\u4ee5\u4fbf\u8ba1\u7b97\u6bcf\u4e2a\u7ec4\u7684\u6c47\u603b\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662fGROUP BY\u5b50\u53e5\u7684\u4e00\u4e9b\u5e38\u89c1\u7528\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6309\u5355\u4e2a\u5217\u8fdb\u884c\u5206\u7ec4<\/li>\n<\/ol>\n\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528GROUP BY\u5b50\u53e5\u6309\u5355\u4e2a\u5217\u8fdb\u884c\u5206\u7ec4\u3002\u4ee5\u4e0b\u793a\u4f8b\u4f7f\u7528GROUP BY\u5b50\u53e5\u6309department\u5217\u5206\u7ec4\uff0c\u8ba1\u7b97\u6bcf\u4e2a\u90e8\u95e8\u7684\u5458\u5de5\u6570\u91cf\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT department, COUNT(*) FROM employees GROUP BY department;\n<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>\u6309\u591a\u4e2a\u5217\u8fdb\u884c\u5206\u7ec4<\/li>\n<\/ol>\n\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528GROUP BY\u5b50\u53e5\u6309\u591a\u4e2a\u5217\u8fdb\u884c\u5206\u7ec4\u3002\u5728\u6307\u5b9a\u591a\u4e2a\u5217\u65f6\uff0c\u6309\u7167\u5217\u540d\u7684\u987a\u5e8f\u8fdb\u884c\u5206\u7ec4\u3002\u4ee5\u4e0b\u793a\u4f8b\u4f7f\u7528GROUP BY\u5b50\u53e5\u6309department\u548cage\u5217\u5206\u7ec4\uff0c\u8ba1\u7b97\u6bcf\u4e2a\u90e8\u95e8\u6bcf\u4e2a\u5e74\u9f84\u6bb5\u7684\u5458\u5de5\u6570\u91cf\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT department, age, COUNT(*) FROM employees GROUP BY department, age;\n<\/code><\/pre>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4f7f\u7528GROUP BY\u5b50\u53e5\u65f6\uff0c\u5e94\u8be5\u786e\u4fdd\u5217\u540d\u6b63\u786e\uff0c\u5e76\u4e14\u5217\u4e2d\u7684\u6570\u636e\u7c7b\u578b\u76f8\u540c\uff0c\u4ee5\u4fbf\u6b63\u786e\u5206\u7ec4\u3002\u53e6\u5916\uff0c\u5728\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\u65f6\uff0c\u4f7f\u7528GROUP BY\u5b50\u53e5\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u4f7f\u7528\u7d22\u5f15\u6216\u5176\u4ed6\u4f18\u5316\u6280\u672f\u6765\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5206\u7ec4\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4e0d\u540c\u7684DBMS\u4e2d\uff0cGROUP BY\u5b50\u53e5\u7684\u8bed\u6cd5\u548c\u7528\u6cd5\u53ef\u80fd\u7565\u6709\u4e0d\u540c\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u67e5\u8be2HAVING\u5b50\u53e5\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0cHAVING\u5b50\u53e5\u662fSELECT\u8bed\u53e5\u7684\u4e00\u4e2a\u53ef\u9009\u90e8\u5206\uff0c\u7528\u4e8e\u8fc7\u6ee4\u5206\u7ec4\u540e\u7684\u7ed3\u679c\u3002\u4e0eWHERE\u5b50\u53e5\u4e0d\u540c\uff0cHAVING\u5b50\u53e5\u7528\u4e8e\u8fc7\u6ee4\u5206\u7ec4\u7684\u7ed3\u679c\u96c6\uff0c\u800c\u4e0d\u662f\u8fc7\u6ee4\u884c\u7ea7\u522b\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662fHAVING\u5b50\u53e5\u7684\u4e00\u4e9b\u5e38\u89c1\u7528\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u8fc7\u6ee4\u805a\u5408\u51fd\u6570\u7ed3\u679c<\/li>\n<\/ol>\n\n\n\n<p>\u53ef\u4ee5\u4f7f\u7528HAVING\u5b50\u53e5\u8fc7\u6ee4\u805a\u5408\u51fd\u6570\u7ed3\u679c\u3002\u4ee5\u4e0b\u793a\u4f8b\u4f7f\u7528HAVING\u5b50\u53e5\u8fc7\u6ee4\u90e8\u95e8\u5458\u5de5\u6570\u91cf\u5927\u4e8e10\u7684\u90e8\u95e8\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT department, COUNT(*) FROM employees GROUP BY department HAVING COUNT(*) &gt; 10;\n<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>\u4f7f\u7528\u805a\u5408\u51fd\u6570<\/li>\n<\/ol>\n\n\n\n<p>\u53ef\u4ee5\u5728HAVING\u5b50\u53e5\u4e2d\u4f7f\u7528\u805a\u5408\u51fd\u6570\u3002\u4ee5\u4e0b\u793a\u4f8b\u4f7f\u7528HAVING\u5b50\u53e5\u8ba1\u7b97\u90e8\u95e8\u5458\u5de5\u6570\u91cf\u7684\u5e73\u5747\u503c\uff0c\u5e76\u8fc7\u6ee4\u5e73\u5747\u503c\u5927\u4e8e20\u7684\u90e8\u95e8\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT department, AVG(age) FROM employees GROUP BY department HAVING AVG(age) &gt; 20;\n<\/code><\/pre>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4f7f\u7528HAVING\u5b50\u53e5\u65f6\uff0c\u5e94\u8be5\u786e\u4fdd\u4f7f\u7528\u6b63\u786e\u7684\u8bed\u6cd5\u548c\u6b63\u786e\u7684\u5217\u540d\uff0c\u5e76\u4e14HAVING\u5b50\u53e5\u4e2d\u7684\u805a\u5408\u51fd\u6570\u548cGROUP BY\u5b50\u53e5\u4e2d\u7684\u5217\u540d\u76f8\u5339\u914d\u3002\u53e6\u5916\uff0c\u5728\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\u65f6\uff0c\u4f7f\u7528HAVING\u5b50\u53e5\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u4f7f\u7528\u7d22\u5f15\u6216\u5176\u4ed6\u4f18\u5316\u6280\u672f\u6765\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u805a\u5408\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4e0d\u540c\u7684DBMS\u4e2d\uff0cHAVING\u5b50\u53e5\u7684\u8bed\u6cd5\u548c\u7528\u6cd5\u53ef\u80fd\u7565\u6709\u4e0d\u540c\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u66f4\u65b0INSERT\u8bed\u53e5\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>SQL INSERT\u8bed\u53e5\u7528\u4e8e\u5c06\u65b0\u7684\u884c\u63d2\u5165\u5230\u8868\u4e2d\u3002\u4ee5\u4e0b\u662fINSERT\u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>INSERT INTO table_name (column1, column2, column3,...) VALUES (value1, value2, value3,...);\n<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff0ctable_name \u662f\u8981\u63d2\u5165\u65b0\u884c\u7684\u8868\u540d\uff0ccolumn1\u3001column2\u3001column3 \u7b49\u662f\u8981\u63d2\u5165\u6570\u636e\u7684\u5217\u540d\uff0cVALUES\u5173\u952e\u5b57\u540e\u9762\u7684\u503c\u662f\u8981\u63d2\u5165\u7684\u5b9e\u9645\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3aemployees\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542bid\u3001name\u548cage\u7b49\u5217\u3002\u8981\u5411\u8be5\u8868\u4e2d\u63d2\u5165\u4e00\u6761\u65b0\u7684\u8bb0\u5f55\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bINSERT\u8bed\u53e5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>INSERT INTO employees (id, name, age) VALUES (1, 'John Smith', 25);\n<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8ff0\u8bed\u53e5\u4f1a\u5c06\u4e00\u6761\u65b0\u8bb0\u5f55\u63d2\u5165employees\u8868\u4e2d\uff0c\u8be5\u8bb0\u5f55\u7684id\u5217\u503c\u4e3a1\uff0cname\u5217\u503c\u4e3a&#8217;John Smith&#8217;\uff0cage\u5217\u503c\u4e3a25\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u63d2\u5165\u7684\u5217\u4e0d\u5b8c\u6574\uff0c\u4e5f\u5c31\u662f\u8bf4\u6ca1\u6709\u4e3a\u6bcf\u4e2a\u5217\u63d0\u4f9b\u4e00\u4e2a\u503c\uff0c\u5219\u5fc5\u987b\u663e\u5f0f\u6307\u5b9a\u8981\u63d2\u5165\u503c\u7684\u5217\u540d\u3002\u4f8b\u5982\uff0c\u5982\u679c\u8981\u5c06\u65b0\u8bb0\u5f55\u63d2\u5165\u5230employees\u8868\u4e2d\uff0c\u4f46\u53ea\u6307\u5b9a\u4e86id\u548cname\u5217\u7684\u503c\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bINSERT\u8bed\u53e5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>INSERT INTO employees (id, name) VALUES (2, 'Jane Doe');\n<\/code><\/pre>\n\n\n\n<p>\u53e6\u5916\uff0c\u5982\u679c\u8981\u5c06\u591a\u4e2a\u8bb0\u5f55\u63d2\u5165\u5230\u8868\u4e2d\uff0c\u53ef\u4ee5\u5728VALUES\u5b50\u53e5\u4e2d\u6307\u5b9a\u591a\u4e2a\u503c\u7ec4\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>INSERT INTO employees (id, name, age) VALUES (3, 'Bob Johnson', 30), (4, 'Mary Brown', 28), (5, 'David Lee', 35);\n<\/code><\/pre>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u63d2\u5165\u65b0\u884c\u65f6\uff0c\u5e94\u8be5\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u6b63\u786e\u6027\uff0c\u5e76\u907f\u514d\u63d2\u5165\u91cd\u590d\u6216\u65e0\u6548\u6570\u636e\u3002\u53e6\u5916\uff0c\u4e5f\u8981\u6ce8\u610f\u4f7f\u7528\u6b63\u786e\u7684\u6570\u636e\u7c7b\u578b\u548c\u683c\u5f0f\uff0c\u5e76\u5728\u9700\u8981\u65f6\u4f7f\u7528\u8f6c\u6362\u51fd\u6570\u8fdb\u884c\u8f6c\u6362\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u66f4\u65b0UPDATE\u8bed\u53e5\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>SQL UPDATE\u8bed\u53e5\u7528\u4e8e\u66f4\u65b0\u8868\u4e2d\u7684\u73b0\u6709\u884c\u3002\u4ee5\u4e0b\u662fUPDATE\u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>UPDATE table_name SET column1=value1, column2=value2, ... WHERE condition;\n<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff0ctable_name \u662f\u8981\u66f4\u65b0\u7684\u8868\u540d\uff0ccolumn1\u3001column2 \u7b49\u662f\u8981\u66f4\u65b0\u7684\u5217\u540d\uff0cvalue1\u3001value2 \u7b49\u662f\u8981\u66f4\u65b0\u7684\u503c\uff0ccondition\u662f\u9009\u62e9\u8981\u66f4\u65b0\u7684\u884c\u7684\u6761\u4ef6\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3aemployees\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542bid\u3001name\u548cage\u7b49\u5217\u3002\u8981\u66f4\u65b0\u8be5\u8868\u4e2did\u4e3a1\u7684\u5458\u5de5\u7684age\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bUPDATE\u8bed\u53e5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>UPDATE employees SET age=30 WHERE id=1;\n<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8ff0\u8bed\u53e5\u4f1a\u5c06employees\u8868\u4e2did\u4e3a1\u7684\u5458\u5de5\u7684age\u5217\u503c\u66f4\u65b0\u4e3a30\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u66f4\u65b0\u884c\u65f6\uff0c\u5e94\u8be5\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u6b63\u786e\u6027\uff0c\u5e76\u907f\u514d\u66f4\u65b0\u91cd\u590d\u6216\u65e0\u6548\u6570\u636e\u3002\u53e6\u5916\uff0c\u4e5f\u8981\u6ce8\u610f\u4f7f\u7528\u6b63\u786e\u7684\u6570\u636e\u7c7b\u578b\u548c\u683c\u5f0f\uff0c\u5e76\u5728\u9700\u8981\u65f6\u4f7f\u7528\u8f6c\u6362\u51fd\u6570\u8fdb\u884c\u8f6c\u6362\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u8981\u66f4\u65b0\u591a\u4e2a\u5217\u7684\u503c\uff0c\u53ef\u4ee5\u5728SET\u5b50\u53e5\u4e2d\u6307\u5b9a\u591a\u4e2a\u5217\u548c\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>UPDATE employees SET name='Amy Johnson', age=35 WHERE id=2;\n<\/code><\/pre>\n\n\n\n<p>\u53e6\u5916\uff0c\u5982\u679c\u8981\u66f4\u65b0\u6240\u6709\u884c\u7684\u503c\uff0c\u5219\u53ef\u4ee5\u7701\u7565WHERE\u5b50\u53e5\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>UPDATE employees SET age=age+1;\n<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8ff0\u8bed\u53e5\u5c06employees\u8868\u4e2d\u6240\u6709\u5458\u5de5\u7684age\u5217\u503c\u589e\u52a01\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u66f4\u65b0\u884c\u65f6\uff0c\u5e94\u8be5\u9075\u5faa\u6b63\u786e\u7684\u8bed\u6cd5\u548c\u8bed\u4e49\uff0c\u907f\u514d\u610f\u5916\u6216\u610f\u5916\u7684\u7ed3\u679c\u3002\u4f8b\u5982\uff0c\u5728\u66f4\u65b0\u591a\u4e2a\u884c\u65f6\uff0c\u5e94\u8be5\u4f7f\u7528\u5408\u9002\u7684\u4e8b\u52a1\u548c\u9501\u673a\u5236\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u66f4\u65b0DELETE\u8bed\u53e5\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>SQL DELETE\u8bed\u53e5\u7528\u4e8e\u5220\u9664\u8868\u4e2d\u7684\u884c\u3002\u4ee5\u4e0b\u662fDELETE\u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>DELETE FROM table_name WHERE condition;\n<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff0ctable_name \u662f\u8981\u5220\u9664\u884c\u7684\u8868\u540d\uff0ccondition\u662f\u9009\u62e9\u8981\u5220\u9664\u884c\u7684\u6761\u4ef6\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3aemployees\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542bid\u3001name\u548cage\u7b49\u5217\u3002\u8981\u5220\u9664\u8be5\u8868\u4e2did\u4e3a1\u7684\u5458\u5de5\u884c\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bDELETE\u8bed\u53e5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>DELETE FROM employees WHERE id=1;\n<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8ff0\u8bed\u53e5\u4f1a\u4eceemployees\u8868\u4e2d\u5220\u9664id\u4e3a1\u7684\u5458\u5de5\u884c\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u5220\u9664\u884c\u65f6\uff0c\u5e94\u8be5\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u6b63\u786e\u6027\uff0c\u5e76\u907f\u514d\u5220\u9664\u91cd\u590d\u6216\u65e0\u6548\u6570\u636e\u3002\u53e6\u5916\uff0c\u4e5f\u8981\u6ce8\u610f\u4f7f\u7528\u6b63\u786e\u7684\u6570\u636e\u7c7b\u578b\u548c\u683c\u5f0f\uff0c\u5e76\u5728\u9700\u8981\u65f6\u4f7f\u7528\u8f6c\u6362\u51fd\u6570\u8fdb\u884c\u8f6c\u6362\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u8981\u5220\u9664\u6240\u6709\u884c\uff0c\u5219\u53ef\u4ee5\u7701\u7565WHERE\u5b50\u53e5\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>DELETE FROM employees;\n<\/code><\/pre>\n\n\n\n<p>\u4e0a\u8ff0\u8bed\u53e5\u5c06\u5220\u9664employees\u8868\u4e2d\u7684\u6240\u6709\u884c\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u5220\u9664\u6240\u6709\u884c\u65f6\uff0c\u5e94\u8be5\u7279\u522b\u5c0f\u5fc3\uff0c\u56e0\u4e3a\u6b64\u64cd\u4f5c\u5c06\u6e05\u7a7a\u6574\u4e2a\u8868\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u4e22\u5931\u6216\u4e0d\u53ef\u6062\u590d\u3002\u56e0\u6b64\uff0c\u5e94\u8be5\u5728\u4f7f\u7528\u6b64\u64cd\u4f5c\u4e4b\u524d\u5907\u4efd\u6570\u636e\uff0c\u5e76\u907f\u514d\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u4f7f\u7528\u6b64\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p>\u53e6\u5916\uff0c\u5982\u679c\u8981\u5220\u9664\u591a\u4e2a\u8868\u4e2d\u7684\u884c\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528JOIN\u5b50\u53e5\u6216\u5b50\u67e5\u8be2\u6765\u5b9e\u73b0\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u8bed\u53e5\u5c06\u4eceemployees\u548cdepartments\u8868\u4e2d\u5220\u9664\u6240\u6709age\u5927\u4e8e40\u5c81\u7684\u5458\u5de5\u6240\u5728\u7684\u90e8\u95e8\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>DELETE FROM employees WHERE department_id IN (SELECT department_id FROM departments WHERE age &gt; 40);\n<\/code><\/pre>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u8868\u8bbe\u8ba1\u6570\u636e\u5e93\u8303\u5f0f\u7684\u6982\u5ff5<\/p>\n\n\n\n<p>\u5728\u5173\u7cfb\u6570\u636e\u5e93\u4e2d\uff0c\u8303\u5f0f\u662f\u4e00\u7ec4\u89c4\u5219\uff0c\u7528\u4e8e\u6307\u5bfc\u5982\u4f55\u8bbe\u8ba1\u8868\u4ee5\u907f\u514d\u5197\u4f59\u548c\u4e0d\u4e00\u81f4\u7684\u6570\u636e\u3002\u8303\u5f0f\u662f\u7528\u6765\u68c0\u67e5\u8868\u8bbe\u8ba1\u7684\u6b63\u786e\u6027\u548c\u4f18\u5316\u7684\u91cd\u8981\u5de5\u5177\u3002<\/p>\n\n\n\n<p>\u5e38\u7528\u7684\u8303\u5f0f\u67091NF\u30012NF\u30013NF\u3001BCNF\u7b49\u3002\u4e0b\u9762\u5206\u522b\u5bf9\u5b83\u4eec\u8fdb\u884c\u8be6\u7ec6\u89e3\u91ca\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7b2c\u4e00\u8303\u5f0f\uff081NF\uff09<\/li>\n<\/ol>\n\n\n\n<p>\u7b2c\u4e00\u8303\u5f0f\u8981\u6c42\u8868\u4e2d\u7684\u6bcf\u4e2a\u5c5e\u6027\u90fd\u662f\u539f\u5b50\u6027\u7684\uff0c\u5373\u4e0d\u53ef\u518d\u5206\u7684\uff0c\u4e0d\u5305\u542b\u96c6\u5408\u6216\u6570\u7ec4\u7b49\u590d\u6742\u7c7b\u578b\u3002\u5982\u679c\u8868\u4e0d\u6ee1\u8db31NF\uff0c\u5219\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u5197\u4f59\u548c\u4e0d\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>\u7b2c\u4e8c\u8303\u5f0f\uff082NF\uff09<\/li>\n<\/ol>\n\n\n\n<p>\u7b2c\u4e8c\u8303\u5f0f\u8981\u6c42\u8868\u4e2d\u7684\u6bcf\u4e2a\u975e\u4e3b\u952e\u5c5e\u6027\u90fd\u5b8c\u5168\u4f9d\u8d56\u4e8e\u4e3b\u952e\uff0c\u800c\u4e0d\u662f\u4f9d\u8d56\u4e8e\u4e3b\u952e\u7684\u4e00\u90e8\u5206\u3002\u5982\u679c\u8868\u4e0d\u6ee1\u8db32NF\uff0c\u5219\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u5197\u4f59\u548c\u4e0d\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>\u7b2c\u4e09\u8303\u5f0f\uff083NF\uff09<\/li>\n<\/ol>\n\n\n\n<p>\u7b2c\u4e09\u8303\u5f0f\u8981\u6c42\u8868\u4e2d\u7684\u6bcf\u4e2a\u975e\u4e3b\u952e\u5c5e\u6027\u90fd\u4e0d\u4f9d\u8d56\u4e8e\u5176\u4ed6\u975e\u4e3b\u952e\u5c5e\u6027\u3002\u5982\u679c\u8868\u4e0d\u6ee1\u8db33NF\uff0c\u5219\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u5197\u4f59\u548c\u4e0d\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"4\">\n<li>\u5df4\u65af-\u79d1\u5fb7\u8303\u5f0f\uff08BCNF\uff09<\/li>\n<\/ol>\n\n\n\n<p>BCNF\u8981\u6c42\u8868\u4e2d\u7684\u6bcf\u4e2a\u975e\u4e3b\u952e\u5c5e\u6027\u90fd\u72ec\u7acb\u4e8e\u6240\u6709\u5176\u4ed6\u975e\u4e3b\u952e\u5c5e\u6027\u3002\u5982\u679c\u8868\u4e0d\u6ee1\u8db3BCNF\uff0c\u5219\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u5197\u4f59\u548c\u4e0d\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<p>\u8303\u5f0f\u7684\u4f5c\u7528\u662f\u786e\u4fdd\u8868\u8bbe\u8ba1\u7684\u89c4\u8303\u5316\uff0c\u51cf\u5c11\u6570\u636e\u5197\u4f59\u548c\u4e0d\u4e00\u81f4\u6027\uff0c\u63d0\u9ad8\u6570\u636e\u7684\u53ef\u9760\u6027\u548c\u6027\u80fd\u3002\u4f46\u662f\uff0c\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u4e0d\u4e00\u5b9a\u9700\u8981\u4e25\u683c\u9075\u5b88\u6240\u6709\u8303\u5f0f\uff0c\u56e0\u4e3a\u6709\u65f6\u4e3a\u4e86\u6ee1\u8db3\u6027\u80fd\u548c\u5e94\u7528\u8981\u6c42\uff0c\u9700\u8981\u8fdb\u884c\u4e00\u5b9a\u7684\u5197\u4f59\u548c\u4f18\u5316\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u5728\u8bbe\u8ba1\u6570\u636e\u5e93\u65f6\uff0c\u5e94\u8be5\u6839\u636e\u5b9e\u9645\u9700\u6c42\u548c\u7279\u5b9a\u60c5\u51b5\uff0c\u7ed3\u5408\u8303\u5f0f\u548c\u5176\u4ed6\u8bbe\u8ba1\u539f\u5219\u6765\u8fdb\u884c\u8868\u8bbe\u8ba1\u3002\u540c\u65f6\uff0c\u4e5f\u5e94\u8be5\u8fdb\u884c\u9002\u5f53\u7684\u6570\u636e\u89c4\u8303\u5316\u548c\u4f18\u5316\uff0c\u4ee5\u907f\u514d\u6570\u636e\u5197\u4f59\u548c\u4e0d\u4e00\u81f4\u6027\uff0c\u63d0\u9ad8\u6570\u636e\u7684\u53ef\u9760\u6027\u548c\u6027\u80fd\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u8868\u8bbe\u8ba1\u7684\u57fa\u672c\u8bbe\u8ba1\u539f\u5219<\/p>\n\n\n\n<p>\u5728SQL\u8868\u8bbe\u8ba1\u4e2d\uff0c\u6709\u4e00\u4e9b\u57fa\u672c\u8bbe\u8ba1\u539f\u5219\u9700\u8981\u9075\u5faa\uff0c\u4ee5\u786e\u4fdd\u8868\u7ed3\u6784\u7684\u6b63\u786e\u6027\u3001\u4e00\u81f4\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u4ee5\u4e0b\u662fSQL\u8868\u8bbe\u8ba1\u7684\u57fa\u672c\u8bbe\u8ba1\u539f\u5219\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u552f\u4e00\u6807\u8bc6\u7b26<\/li>\n<\/ol>\n\n\n\n<p>\u6bcf\u4e2a\u8868\u90fd\u5e94\u8be5\u6709\u4e00\u4e2a\u552f\u4e00\u6807\u8bc6\u7b26\uff0c\u5b83\u80fd\u591f\u552f\u4e00\u5730\u6807\u8bc6\u8868\u4e2d\u7684\u6bcf\u4e2a\u8bb0\u5f55\u3002\u901a\u5e38\uff0c\u8fd9\u4e2a\u552f\u4e00\u6807\u8bc6\u7b26\u662f\u4e00\u4e2a\u81ea\u589e\u957f\u7684\u6574\u6570\uff0c\u4e5f\u53ef\u4ee5\u662f\u5176\u4ed6\u7c7b\u578b\u7684\u503c\uff0c\u4f8b\u5982GUID\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>\u6570\u636e\u7c7b\u578b\u548c\u7ea6\u675f<\/li>\n<\/ol>\n\n\n\n<p>\u5728\u8bbe\u8ba1\u8868\u65f6\uff0c\u5e94\u8be5\u4e3a\u6bcf\u4e2a\u5217\u6307\u5b9a\u6b63\u786e\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5e76\u4f7f\u7528\u9002\u5f53\u7684\u7ea6\u675f\u6765\u786e\u4fdd\u6570\u636e\u7684\u6b63\u786e\u6027\u548c\u4e00\u81f4\u6027\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528NOT NULL\u7ea6\u675f\u6765\u786e\u4fdd\u5217\u4e2d\u4e0d\u5305\u542bNULL\u503c\uff0c\u4f7f\u7528UNIQUE\u7ea6\u675f\u6765\u786e\u4fdd\u5217\u4e2d\u7684\u503c\u662f\u552f\u4e00\u7684\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>\u6570\u636e\u5197\u4f59<\/li>\n<\/ol>\n\n\n\n<p>\u5e94\u8be5\u5c3d\u91cf\u907f\u514d\u5728\u4e0d\u540c\u8868\u4e4b\u95f4\u51fa\u73b0\u6570\u636e\u5197\u4f59\u3002\u5982\u679c\u591a\u4e2a\u8868\u4e2d\u9700\u8981\u5171\u4eab\u76f8\u540c\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u7528\u5916\u952e\u6765\u5efa\u7acb\u5173\u7cfb\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"4\">\n<li>\u8303\u5f0f\u8bbe\u8ba1<\/li>\n<\/ol>\n\n\n\n<p>\u5e94\u8be5\u5c3d\u91cf\u9075\u5faa\u6570\u636e\u5e93\u8303\u5f0f\u8bbe\u8ba1\u7684\u539f\u5219\uff0c\u4ee5\u786e\u4fdd\u8868\u7ed3\u6784\u7684\u89c4\u8303\u5316\u3002\u8fd9\u53ef\u4ee5\u51cf\u5c11\u6570\u636e\u5197\u4f59\u548c\u4e0d\u4e00\u81f4\u6027\uff0c\u63d0\u9ad8\u6570\u636e\u7684\u53ef\u9760\u6027\u548c\u6027\u80fd\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"5\">\n<li>\u6027\u80fd\u4f18\u5316<\/li>\n<\/ol>\n\n\n\n<p>\u5e94\u8be5\u8003\u8651\u8868\u7ed3\u6784\u7684\u6027\u80fd\u4f18\u5316\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u6765\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\uff0c\u4f7f\u7528\u5206\u533a\u8868\u6765\u63d0\u9ad8\u5927\u6570\u636e\u96c6\u7684\u67e5\u8be2\u6027\u80fd\u7b49\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"6\">\n<li>\u6570\u636e\u5e93\u5b89\u5168\u6027<\/li>\n<\/ol>\n\n\n\n<p>\u5e94\u8be5\u8003\u8651\u8868\u7ed3\u6784\u7684\u5b89\u5168\u6027\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u6743\u9650\u63a7\u5236\u6765\u9650\u5236\u7528\u6237\u7684\u8bbf\u95ee\u6743\u9650\uff0c\u4f7f\u7528\u52a0\u5bc6\u6765\u4fdd\u62a4\u654f\u611f\u6570\u636e\u7b49\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"7\">\n<li>\u6570\u636e\u5e93\u6587\u6863\u5316<\/li>\n<\/ol>\n\n\n\n<p>\u5e94\u8be5\u4e3a\u6bcf\u4e2a\u8868\u548c\u5217\u63d0\u4f9b\u6587\u6863\uff0c\u4ee5\u4fbf\u5176\u4ed6\u4eba\u53ef\u4ee5\u7406\u89e3\u8868\u7684\u542b\u4e49\u548c\u7ed3\u6784\u3002\u6587\u6863\u5e94\u8be5\u5305\u62ec\u8868\u7684\u540d\u79f0\u3001\u5217\u7684\u540d\u79f0\u3001\u6570\u636e\u7c7b\u578b\u3001\u7ea6\u675f\u3001\u5173\u7cfb\u548c\u5176\u4ed6\u91cd\u8981\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u7efc\u4e0a\u6240\u8ff0\uff0cSQL\u8868\u8bbe\u8ba1\u7684\u57fa\u672c\u8bbe\u8ba1\u539f\u5219\u662f\u786e\u4fdd\u8868\u7ed3\u6784\u7684\u6b63\u786e\u6027\u3001\u4e00\u81f4\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u5e94\u8be5\u5c3d\u91cf\u9075\u5faa\u6570\u636e\u5e93\u8303\u5f0f\u8bbe\u8ba1\u7684\u539f\u5219\uff0c\u540c\u65f6\u8003\u8651\u6027\u80fd\u4f18\u5316\u3001\u5b89\u5168\u6027\u548c\u6587\u6863\u5316\u7b49\u56e0\u7d20\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u8868\u8bbe\u8ba1\u4e3b\u952e\u3001\u5916\u952e\u548c\u7d22\u5f15\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>\u5728SQL\u8868\u8bbe\u8ba1\u4e2d\uff0c\u4e3b\u952e\u3001\u5916\u952e\u548c\u7d22\u5f15\u662f\u4e09\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5b83\u4eec\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u4f18\u5316\u6570\u636e\u7684\u8bbf\u95ee\u548c\u67e5\u8be2\u6548\u7387\u3002\u4e0b\u9762\u5bf9\u5b83\u4eec\u7684\u4f7f\u7528\u8fdb\u884c\u8be6\u7ec6\u89e3\u91ca\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4e3b\u952e\uff08Primary 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Key\uff09<\/li>\n<\/ol>\n\n\n\n<p>\u5916\u952e\u662f\u4e00\u79cd\u7528\u4e8e\u5efa\u7acb\u8868\u4e4b\u95f4\u5173\u7cfb\u7684\u5217\u3002\u5b83\u6307\u5411\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u4e3b\u952e\u5217\uff0c\u4ee5\u4fbf\u5efa\u7acb\u8868\u4e4b\u95f4\u7684\u8054\u7cfb\u3002\u5916\u952e\u53ef\u4ee5\u7528\u6765\u786e\u4fdd\u8868\u4e4b\u95f4\u7684\u6570\u636e\u5b8c\u6574\u6027\u3002\u4f8b\u5982\uff0c\u4e00\u4e2a\u8ba2\u5355\u8868\u4e2d\u53ef\u80fd\u5305\u542b\u4e00\u4e2a\u6307\u5411\u5ba2\u6237\u8868\u7684\u5916\u952e\uff0c\u4ee5\u4fbf\u786e\u4fdd\u6bcf\u4e2a\u8ba2\u5355\u90fd\u5bf9\u5e94\u4e8e\u4e00\u4e2a\u6709\u6548\u7684\u5ba2\u6237\u8bb0\u5f55\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>\u7d22\u5f15\uff08Index\uff09<\/li>\n<\/ol>\n\n\n\n<p>\u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u53ef\u4ee5\u52a0\u5feb\u5bf9\u8868\u4e2d\u6570\u636e\u7684\u8bbf\u95ee\u901f\u5ea6\u3002\u7d22\u5f15\u53ef\u4ee5\u57fa\u4e8e\u4e00\u4e2a\u6216\u591a\u4e2a\u5217\u6765\u521b\u5efa\uff0c\u5b83\u4f1a\u5bf9\u8fd9\u4e9b\u5217\u7684\u503c\u8fdb\u884c\u6392\u5e8f\u548c\u5206\u7ec4\uff0c\u4ee5\u4fbf\u66f4\u5feb\u5730\u641c\u7d22\u548c\u8fc7\u6ee4\u6570\u636e\u3002\u5728\u67e5\u8be2\u5927\u578b\u8868\u65f6\uff0c\u7d22\u5f15\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002\u4f46\u662f\uff0c\u7d22\u5f15\u4e5f\u4f1a\u589e\u52a0\u8868\u7684\u5199\u5165\u64cd\u4f5c\u7684\u5f00\u9500\u3002<\/p>\n\n\n\n<p>\u5728\u4f7f\u7528\u4e3b\u952e\u3001\u5916\u952e\u548c\u7d22\u5f15\u65f6\uff0c\u5e94\u8be5\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4e3b\u952e\u3001\u5916\u952e\u548c\u7d22\u5f15\u5e94\u8be5\u6b63\u786e\u5730\u5b9a\u4e49\uff0c\u4ee5\u786e\u4fdd\u5b83\u4eec\u80fd\u591f\u6ee1\u8db3\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\u548c\u67e5\u8be2\u9700\u6c42\u3002<\/li>\n\n\n\n<li>\u7d22\u5f15\u5e94\u8be5\u4ec5\u5728\u9700\u8981\u52a0\u901f\u67e5\u8be2\u65f6\u624d\u521b\u5efa\u3002\u8fc7\u591a\u7684\u7d22\u5f15\u4f1a\u964d\u4f4e\u8868\u7684\u5199\u5165\u64cd\u4f5c\u6027\u80fd\uff0c\u5e76\u5360\u7528\u5927\u91cf\u78c1\u76d8\u7a7a\u95f4\u3002<\/li>\n\n\n\n<li>\u5916\u952e\u5e94\u8be5\u4e0e\u4e3b\u952e\u76f8\u5bf9\u5e94\uff0c\u4ee5\u786e\u4fdd\u8868\u4e4b\u95f4\u7684\u6570\u636e\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002<\/li>\n\n\n\n<li>\u5728\u521b\u5efa\u5916\u952e\u548c\u7d22\u5f15\u65f6\uff0c\u5e94\u8be5\u8003\u8651\u4f7f\u7528\u9002\u5f53\u7684\u7ea6\u675f\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u6b63\u786e\u6027\u548c\u4e00\u81f4\u6027\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u7efc\u4e0a\u6240\u8ff0\uff0c\u4e3b\u952e\u3001\u5916\u952e\u548c\u7d22\u5f15\u662fSQL\u8868\u8bbe\u8ba1\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5b83\u4eec\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u4f18\u5316\u6570\u636e\u7684\u8bbf\u95ee\u548c\u67e5\u8be2\u6548\u7387\u3002\u5e94\u8be5\u6b63\u786e\u5730\u5b9a\u4e49\u5b83\u4eec\uff0c\u5e76\u9075\u5faa\u826f\u597d\u7684\u8bbe\u8ba1\u539f\u5219\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u6b63\u786e\u6027\u548c\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u8868\u8bbe\u8ba1\u89c6\u56fe\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>\u5728 SQL \u4e2d\uff0c\u89c6\u56fe\u662f\u7531\u4e00\u4e2a\u6216\u591a\u4e2a\u8868\u7684\u884c\u6216\u5217\u7ec4\u6210\u7684\u865a\u62df\u8868\u3002\u89c6\u56fe\u4e0e\u5b9e\u9645\u8868\u4e0d\u540c\uff0c\u5176\u672c\u8eab\u5e76\u4e0d\u5b58\u50a8\u6570\u636e\uff0c\u800c\u662f\u4ec5\u5b58\u50a8\u5b9a\u4e49\u3002\u5728 SQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 CREATE VIEW \u8bed\u53e5\u521b\u5efa\u89c6\u56fe\uff0c\u4f7f\u7528 SELECT \u8bed\u53e5\u5b9a\u4e49\u89c6\u56fe\u7684\u67e5\u8be2\u8bed\u53e5\u3002<\/p>\n\n\n\n<p>\u89c6\u56fe\u53ef\u4ee5\u63d0\u4f9b\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\u7684\u4f18\u52bf\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7b80\u5316\u67e5\u8be2\uff1a\u89c6\u56fe\u53ef\u4ee5\u9690\u85cf\u590d\u6742\u7684 SQL \u67e5\u8be2\uff0c\u4f7f\u7528\u6237\u53ef\u4ee5\u66f4\u8f7b\u677e\u5730\u4f7f\u7528\u6570\u636e\u5e93\u3002<\/li>\n\n\n\n<li>\u7ba1\u7406\u5b89\u5168\u6027\uff1a\u901a\u8fc7\u89c6\u56fe\uff0c\u53ef\u4ee5\u4e3a\u7528\u6237\u63d0\u4f9b\u5bf9\u6570\u636e\u5e93\u7279\u5b9a\u6570\u636e\u7684\u8bbf\u95ee\u6743\u9650\uff0c\u800c\u4e0d\u662f\u63d0\u4f9b\u5bf9\u6574\u4e2a\u8868\u7684\u8bbf\u95ee\u6743\u9650\u3002<\/li>\n\n\n\n<li>\u6539\u8fdb\u6027\u80fd\uff1a\u53ef\u4ee5\u4f7f\u7528\u89c6\u56fe\u6765\u7ec4\u7ec7\u590d\u6742\u7684\u67e5\u8be2\u8bed\u53e5\uff0c\u63d0\u9ad8\u67e5\u8be2\u7684\u6548\u7387\u3002<\/li>\n\n\n\n<li>\u7b80\u5316\u6570\u636e\u66f4\u65b0\uff1a\u901a\u8fc7\u89c6\u56fe\uff0c\u53ef\u4ee5\u7b80\u5316\u5bf9\u6570\u636e\u5e93\u4e2d\u591a\u4e2a\u8868\u7684\u66f4\u65b0\u64cd\u4f5c\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u521b\u5efa\u89c6\u56fe\u65f6\u9700\u8981\u8003\u8651\u4ee5\u4e0b\u51e0\u4e2a\u95ee\u9898\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u89c6\u56fe\u7684\u540d\u79f0\uff1a\u89c6\u56fe\u5e94\u8be5\u4f7f\u7528\u6709\u610f\u4e49\u7684\u540d\u79f0\uff0c\u4ee5\u4fbf\u7528\u6237\u53ef\u4ee5\u8f7b\u677e\u7406\u89e3\u5176\u4f5c\u7528\u3002<\/li>\n\n\n\n<li>\u89c6\u56fe\u7684\u67e5\u8be2\u8bed\u53e5\uff1a\u89c6\u56fe\u5e94\u8be5\u4f7f\u7528 SELECT \u8bed\u53e5\u5b9a\u4e49\u5176\u67e5\u8be2\u8bed\u53e5\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u4e2a\u8868\u548c\u6761\u4ef6\uff0c\u8fd9\u6837\u53ef\u4ee5\u83b7\u5f97\u66f4\u5177\u4f53\u7684\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u89c6\u56fe\u7684\u5b89\u5168\u6027\uff1a\u5e94\u8be5\u4e3a\u89c6\u56fe\u8bbe\u7f6e\u9002\u5f53\u7684\u8bbf\u95ee\u6743\u9650\uff0c\u4ee5\u4fbf\u7528\u6237\u53ea\u80fd\u8bbf\u95ee\u4ed6\u4eec\u9700\u8981\u7684\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u89c6\u56fe\u7684\u66f4\u65b0\u6027\uff1a\u9700\u8981\u8003\u8651\u89c6\u56fe\u662f\u5426\u53ef\u4ee5\u7528\u4e8e\u66f4\u65b0\u64cd\u4f5c\uff0c\u5982\u679c\u53ef\u4ee5\uff0c\u9700\u8981\u786e\u4fdd\u66f4\u65b0\u4e0d\u4f1a\u5f71\u54cd\u5b9e\u9645\u8868\u7684\u5b8c\u6574\u6027\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u89c6\u56fe\u7684\u4f7f\u7528\u9700\u8981\u8c28\u614e\uff0c\u56e0\u4e3a\u5b83\u4eec\u53ef\u80fd\u4f1a\u5e26\u6765\u4e00\u4e9b\u6027\u80fd\u95ee\u9898\u3002\u5982\u679c\u89c6\u56fe\u88ab\u8bbe\u8ba1\u5f97\u4e0d\u5f53\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u67e5\u8be2\u6548\u7387\u4f4e\u4e0b\uff0c\u5c24\u5176\u662f\u5f53\u67e5\u8be2\u9700\u8981\u4ece\u591a\u4e2a\u89c6\u56fe\u4e2d\u68c0\u7d22\u6570\u636e\u65f6\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u5b50\u67e5\u8be2\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>\u5728 SQL \u4e2d\uff0c\u5b50\u67e5\u8be2\u662f\u4e00\u4e2a\u5d4c\u5957\u7684\u67e5\u8be2\uff0c\u53ef\u4ee5\u5728\u4e00\u4e2a\u67e5\u8be2\u4e2d\u4f7f\u7528\u53e6\u4e00\u4e2a\u67e5\u8be2\u7684\u7ed3\u679c\u3002\u5b50\u67e5\u8be2\u5728 SELECT\u3001INSERT\u3001UPDATE \u548c DELETE \u8bed\u53e5\u4e2d\u90fd\u53ef\u4ee5\u4f7f\u7528\u3002<\/p>\n\n\n\n<p>\u5b50\u67e5\u8be2\u7684\u4e00\u822c\u5f62\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT column1, column2, ...\nFROM table_name\nWHERE column_name operator\n(SELECT column_name FROM table_name WHERE condition);\n<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u8bed\u53e5\u4e2d\uff0c\u5b50\u67e5\u8be2 <code>(SELECT column_name FROM table_name WHERE condition)<\/code> \u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u8be5\u7ed3\u679c\u96c6\u4f5c\u4e3a\u5916\u90e8\u67e5\u8be2\u7684\u6761\u4ef6\u4e4b\u4e00\u3002<\/p>\n\n\n\n<p>\u5b50\u67e5\u8be2\u901a\u5e38\u7528\u4e8e\u4ee5\u4e0b\u60c5\u51b5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u68c0\u7d22\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u7684\u6570\u636e\uff1a\u5b50\u67e5\u8be2\u53ef\u4ee5\u8fd4\u56de\u4e00\u4e2a\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u7684\u6570\u636e\u96c6\uff0c\u8fd9\u4e2a\u6570\u636e\u96c6\u53ef\u4ee5\u7528\u4e8e\u53e6\u4e00\u4e2a\u67e5\u8be2\u7684\u6761\u4ef6\u4e2d\u3002<\/li>\n\n\n\n<li>\u68c0\u67e5\u6570\u636e\u662f\u5426\u5b58\u5728\uff1a\u53ef\u4ee5\u4f7f\u7528\u5b50\u67e5\u8be2\u6765\u68c0\u67e5\u4e00\u4e2a\u8868\u4e2d\u662f\u5426\u5b58\u5728\u4e00\u4e2a\u7279\u5b9a\u7684\u503c\u6216\u4e00\u7ec4\u503c\u3002<\/li>\n\n\n\n<li>\u68c0\u67e5\u6570\u636e\u662f\u5426\u7b26\u5408\u7279\u5b9a\u6761\u4ef6\uff1a\u53ef\u4ee5\u4f7f\u7528\u5b50\u67e5\u8be2\u6765\u68c0\u67e5\u4e00\u7ec4\u6570\u636e\u662f\u5426\u7b26\u5408\u7279\u5b9a\u7684\u6761\u4ef6\uff0c\u7136\u540e\u5728\u53e6\u4e00\u4e2a\u67e5\u8be2\u4e2d\u4f7f\u7528\u8fd9\u4e9b\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u8fdb\u884c\u6570\u636e\u805a\u5408\uff1a\u53ef\u4ee5\u4f7f\u7528\u5b50\u67e5\u8be2\u6765\u805a\u5408\u6570\u636e\uff0c\u4f8b\u5982\u8ba1\u7b97\u5e73\u5747\u503c\u3001\u603b\u548c\u7b49\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u4f7f\u7528\u5b50\u67e5\u8be2\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5b50\u67e5\u8be2\u5e94\u8be5\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u8be5\u7ed3\u679c\u96c6\u53ef\u4ee5\u4e0e\u5916\u90e8\u67e5\u8be2\u7684\u7ed3\u679c\u96c6\u8fdb\u884c\u6bd4\u8f83\u6216\u8fc7\u6ee4\u3002<\/li>\n\n\n\n<li>\u5b50\u67e5\u8be2\u5e94\u8be5\u4f7f\u7528\u5706\u62ec\u53f7\u62ec\u8d77\u6765\uff0c\u4ee5\u533a\u5206\u5b83\u4eec\u4e0e\u5916\u90e8\u67e5\u8be2\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/li>\n\n\n\n<li>\u5b50\u67e5\u8be2\u5e94\u8be5\u4f7f\u7528\u9002\u5f53\u7684\u6761\u4ef6\u8fdb\u884c\u7b5b\u9009\uff0c\u4ee5\u4fbf\u8fd4\u56de\u6240\u9700\u7684\u7ed3\u679c\u96c6\u3002<\/li>\n\n\n\n<li>\u5b50\u67e5\u8be2\u7684\u6027\u80fd\u53ef\u80fd\u4f1a\u53d7\u5230\u5f71\u54cd\uff0c\u56e0\u6b64\u5e94\u8be5\u907f\u514d\u8fc7\u591a\u7684\u5d4c\u5957\u548c\u590d\u6742\u7684\u67e5\u8be2\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528\u5b50\u67e5\u8be2\u7684\u4f8b\u5b50\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT customer_name\nFROM customers\nWHERE customer_id IN\n  (SELECT customer_id\n   FROM orders\n   WHERE order_date &gt;= '2022-01-01');\n<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5b50\u67e5\u8be2 <code>(SELECT customer_id FROM orders WHERE order_date &gt;= '2022-01-01')<\/code> \u8fd4\u56de\u6240\u6709\u5728 2022 \u5e74 1 \u6708 1 \u65e5\u6216\u4e4b\u540e\u4e0b\u4e86\u8ba2\u5355\u7684\u5ba2\u6237 ID\u3002\u5916\u90e8\u67e5\u8be2\u4f7f\u7528 <code>IN<\/code> \u64cd\u4f5c\u7b26\u5c06\u8fd9\u4e9b\u5ba2\u6237 ID \u4e0e <code>customers<\/code> \u8868\u4e2d\u7684\u5ba2\u6237 ID \u8fdb\u884c\u6bd4\u8f83\uff0c\u4ece\u800c\u8fd4\u56de\u8fd9\u4e9b\u5ba2\u6237\u7684\u540d\u79f0\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u67e5\u8be2JOIN\u7684\u4f7f\u7528\uff0c\u7279\u522b\u662f\u5185\u8fde\u63a5\uff0c\u5de6\u8fde\u63a5\u548c\u53f3\u8fde\u63a5<\/p>\n\n\n\n<p>SQL\u67e5\u8be2JOIN\u662f\u5c06\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u6570\u636e\u5408\u5e76\u6210\u4e00\u7ec4\u6570\u636e\u7684\u64cd\u4f5c\u3002JOIN\u64cd\u4f5c\u53ef\u4ee5\u7528\u4e8e\u591a\u4e2a\u8868\u4e4b\u95f4\u7684\u5173\u8054\u548c\u67e5\u8be2\uff0c\u4ee5\u5b9e\u73b0\u66f4\u590d\u6742\u7684\u67e5\u8be2\u3002JOIN\u64cd\u4f5c\u53ef\u4ee5\u5206\u4e3a\u51e0\u79cd\u7c7b\u578b\uff0c\u5305\u62ec\u5185\u8fde\u63a5\uff0c\u5de6\u8fde\u63a5\u548c\u53f3\u8fde\u63a5\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5185\u8fde\u63a5(INNER JOIN)<\/li>\n<\/ol>\n\n\n\n<p>\u5185\u8fde\u63a5\u8fd4\u56de\u4e24\u4e2a\u8868\u4e2d\u5171\u6709\u7684\u8bb0\u5f55\u3002\u8fd9\u79cd\u8fde\u63a5\u53ea\u8fd4\u56de\u5728\u4e24\u4e2a\u8868\u4e2d\u90fd\u5b58\u5728\u7684\u884c\u3002\u5176\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT column_name(s)\nFROM table1\nINNER JOIN table2\nON table1.column_name = table2.column_name;\n<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff0c<code>table1<\/code>\u548c<code>table2<\/code>\u662f\u8981\u8fde\u63a5\u7684\u8868\uff0c<code>column_name<\/code>\u662f\u8981\u9009\u62e9\u7684\u5217\u540d\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>\u5de6\u8fde\u63a5(LEFT JOIN)<\/li>\n<\/ol>\n\n\n\n<p>\u5de6\u8fde\u63a5\u8fd4\u56de\u5de6\u4fa7\u8868\u4e2d\u7684\u6240\u6709\u8bb0\u5f55\u548c\u53f3\u4fa7\u8868\u4e2d\u7684\u5339\u914d\u8bb0\u5f55\u3002\u5982\u679c\u53f3\u4fa7\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u8bb0\u5f55\uff0c\u5219\u8fd4\u56deNULL\u503c\u3002\u5176\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT column_name(s)\nFROM table1\nLEFT JOIN table2\nON table1.column_name = table2.column_name;\n<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff0c<code>table1<\/code>\u548c<code>table2<\/code>\u662f\u8981\u8fde\u63a5\u7684\u8868\uff0c<code>column_name<\/code>\u662f\u8981\u9009\u62e9\u7684\u5217\u540d\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>\u53f3\u8fde\u63a5(RIGHT JOIN)<\/li>\n<\/ol>\n\n\n\n<p>\u53f3\u8fde\u63a5\u8fd4\u56de\u53f3\u4fa7\u8868\u4e2d\u7684\u6240\u6709\u8bb0\u5f55\u548c\u5de6\u4fa7\u8868\u4e2d\u7684\u5339\u914d\u8bb0\u5f55\u3002\u5982\u679c\u5de6\u4fa7\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u8bb0\u5f55\uff0c\u5219\u8fd4\u56deNULL\u503c\u3002\u5176\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT column_name(s)\nFROM table1\nRIGHT JOIN table2\nON table1.column_name = table2.column_name;\n<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff0c<code>table1<\/code>\u548c<code>table2<\/code>\u662f\u8981\u8fde\u63a5\u7684\u8868\uff0c<code>column_name<\/code>\u662f\u8981\u9009\u62e9\u7684\u5217\u540d\u3002<\/p>\n\n\n\n<p>\u5728\u8fdb\u884cJOIN\u64cd\u4f5c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u4e2a\u8868\u548c\u591a\u4e2a\u6761\u4ef6\u8fdb\u884c\u8fde\u63a5\u3002JOIN\u64cd\u4f5c\u662fSQL\u67e5\u8be2\u4e2d\u975e\u5e38\u6709\u7528\u7684\u4e00\u4e2a\u529f\u80fd\uff0c\u53ef\u4ee5\u901a\u8fc7\u5c06\u591a\u4e2a\u8868\u5408\u5e76\u4e3a\u4e00\u4e2a\u865a\u62df\u8868\u6765\u7b80\u5316\u67e5\u8be2\uff0c\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u4e2d\u805a\u5408\u51fd\u6570\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>SQL\u4e2d\u7684\u805a\u5408\u51fd\u6570\u662f\u5bf9\u4e00\u5217\u6216\u591a\u5217\u6570\u636e\u6267\u884c\u8ba1\u7b97\u7684\u51fd\u6570\uff0c\u901a\u5e38\u7528\u4e8e\u5bf9\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u6c47\u603b\u6216\u7edf\u8ba1\u3002\u805a\u5408\u51fd\u6570\u53ef\u4ee5\u8ba1\u7b97\u6700\u5927\u503c\u3001\u6700\u5c0f\u503c\u3001\u5e73\u5747\u503c\u3001\u603b\u548c\u3001\u8ba1\u6570\u7b49\u3002<\/p>\n\n\n\n<p>SQL\u4e2d\u5e38\u89c1\u7684\u805a\u5408\u51fd\u6570\u5305\u62ec\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>COUNT\uff1a\u8ba1\u7b97\u67d0\u4e2a\u5217\u7684\u884c\u6570\uff0c\u53ef\u4ee5\u7528\u4e8e\u7edf\u8ba1\u6570\u636e\u8868\u4e2d\u67d0\u4e2a\u5217\u7684\u503c\u7684\u6570\u91cf\u3002<\/li>\n\n\n\n<li>SUM\uff1a\u8ba1\u7b97\u67d0\u4e2a\u5217\u7684\u6570\u503c\u603b\u548c\uff0c\u53ef\u4ee5\u7528\u4e8e\u7edf\u8ba1\u6570\u636e\u8868\u4e2d\u67d0\u4e2a\u6570\u503c\u5217\u7684\u603b\u548c\u3002<\/li>\n\n\n\n<li>AVG\uff1a\u8ba1\u7b97\u67d0\u4e2a\u5217\u7684\u5e73\u5747\u503c\uff0c\u53ef\u4ee5\u7528\u4e8e\u7edf\u8ba1\u6570\u636e\u8868\u4e2d\u67d0\u4e2a\u6570\u503c\u5217\u7684\u5e73\u5747\u503c\u3002<\/li>\n\n\n\n<li>MAX\uff1a\u8ba1\u7b97\u67d0\u4e2a\u5217\u7684\u6700\u5927\u503c\uff0c\u53ef\u4ee5\u7528\u4e8e\u7edf\u8ba1\u6570\u636e\u8868\u4e2d\u67d0\u4e2a\u6570\u503c\u5217\u7684\u6700\u5927\u503c\u3002<\/li>\n\n\n\n<li>MIN\uff1a\u8ba1\u7b97\u67d0\u4e2a\u5217\u7684\u6700\u5c0f\u503c\uff0c\u53ef\u4ee5\u7528\u4e8e\u7edf\u8ba1\u6570\u636e\u8868\u4e2d\u67d0\u4e2a\u6570\u503c\u5217\u7684\u6700\u5c0f\u503c\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u8fd9\u4e9b\u805a\u5408\u51fd\u6570\u53ef\u4ee5\u4e0eSELECT\u8bed\u53e5\u7ed3\u5408\u4f7f\u7528\uff0c\u7528\u4e8e\u5728\u67e5\u8be2\u7ed3\u679c\u4e2d\u8fdb\u884c\u8ba1\u7b97\u548c\u6c47\u603b\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">scssCopy code<code>SELECT COUNT(*), SUM(price), AVG(price), MAX(price), MIN(price)\nFROM products;\n<\/code><\/pre>\n\n\n\n<p>\u4ee5\u4e0a\u8bed\u53e5\u5c06\u8fd4\u56de\u6570\u636e\u8868&#8221;products&#8221;\u4e2d\u6240\u6709\u4ea7\u54c1\u7684\u6570\u91cf\uff0c\u4ef7\u683c\u603b\u548c\u3001\u5e73\u5747\u4ef7\u683c\u3001\u6700\u9ad8\u4ef7\u683c\u548c\u6700\u4f4e\u4ef7\u683c\u3002COUNT(*)\u8868\u793a\u8fd4\u56de\u6570\u636e\u8868\u4e2d\u6240\u6709\u884c\u7684\u6570\u91cf\u3002<\/p>\n\n\n\n<p>\u5728\u4f7f\u7528\u805a\u5408\u51fd\u6570\u65f6\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528GROUP BY\u5b50\u53e5\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u7ec4\u3002GROUP BY\u5b50\u53e5\u5c06\u6839\u636e\u6307\u5b9a\u7684\u5217\u5bf9\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u5206\u7ec4\uff0c\u7136\u540e\u5bf9\u6bcf\u4e2a\u5206\u7ec4\u8ba1\u7b97\u805a\u5408\u51fd\u6570\u7684\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">scssCopy code<code>SELECT category, COUNT(*), SUM(price), AVG(price), MAX(price), MIN(price)\nFROM products\nGROUP BY category;\n<\/code><\/pre>\n\n\n\n<p>\u4ee5\u4e0a\u8bed\u53e5\u5c06\u8fd4\u56de\u6309\u4ea7\u54c1\u7c7b\u522b\u5206\u7ec4\u7684\u7edf\u8ba1\u6570\u636e\uff0c\u5305\u62ec\u6bcf\u4e2a\u7c7b\u522b\u4e2d\u4ea7\u54c1\u7684\u6570\u91cf\uff0c\u4ef7\u683c\u603b\u548c\u3001\u5e73\u5747\u4ef7\u683c\u3001\u6700\u9ad8\u4ef7\u683c\u548c\u6700\u4f4e\u4ef7\u683c\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u4e2d\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u7684\u4f7f\u7528<\/p>\n\n\n\n<p>\u5728 SQL \u4e2d\uff0c\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u662f\u4e24\u79cd\u53ef\u91cd\u7528\u7684\u4ee3\u7801\u5355\u5143\uff0c\u53ef\u4ee5\u7531\u7528\u6237\u81ea\u5df1\u5b9a\u4e49\u548c\u8c03\u7528\u3002\u5b83\u4eec\u53ef\u4ee5\u5c01\u88c5\u4e00\u4e2a\u6216\u591a\u4e2a SQL \u8bed\u53e5\uff0c\u5e76\u5c06\u5176\u4f5c\u4e3a\u4e00\u4e2a\u5355\u5143\u8fdb\u884c\u6267\u884c\uff0c\u63d0\u9ad8\u4e86\u4ee3\u7801\u91cd\u7528\u6027\u548c\u6267\u884c\u6548\u7387\u3002<\/p>\n\n\n\n<p>SQL \u5b58\u50a8\u8fc7\u7a0b\u662f\u4e00\u79cd\u9884\u7f16\u8bd1\u7684 SQL \u4ee3\u7801\u5757\uff0c\u7c7b\u4f3c\u4e8e\u7a0b\u5e8f\u4e2d\u7684\u51fd\u6570\u3002\u5b83\u7531\u4e00\u7cfb\u5217 SQL \u8bed\u53e5\u7ec4\u6210\uff0c\u5e76\u53ef\u63a5\u53d7\u53c2\u6570\u3001\u8fd4\u56de\u7ed3\u679c\u6216\u6267\u884c\u4e00\u4e9b\u64cd\u4f5c\u3002\u5b58\u50a8\u8fc7\u7a0b\u901a\u5e38\u7528\u4e8e\u5bf9\u6570\u636e\u5e93\u8fdb\u884c\u590d\u6742\u7684\u64cd\u4f5c\u6216\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\u8c03\u7528\u3002<\/p>\n\n\n\n<p>SQL \u51fd\u6570\u662f\u4e00\u4e2a\u53ef\u91cd\u7528\u7684 SQL \u4ee3\u7801\u5757\uff0c\u53ef\u4ee5\u7528\u4e8e\u8ba1\u7b97\u4e00\u4e2a\u503c\u5e76\u5c06\u5176\u4f5c\u4e3a\u7ed3\u679c\u8fd4\u56de\u3002\u51fd\u6570\u53ef\u4ee5\u63a5\u53d7\u4e00\u4e2a\u6216\u591a\u4e2a\u53c2\u6570\uff0c\u5e76\u5728\u5176\u4ee3\u7801\u5757\u4e2d\u6267\u884c\u4e00\u4e9b\u64cd\u4f5c\u3002\u51fd\u6570\u53ef\u4ee5\u5728 SQL \u67e5\u8be2\u8bed\u53e5\u4e2d\u4f7f\u7528\uff0c\u4e5f\u53ef\u4ee5\u5728\u5176\u4ed6\u5b58\u50a8\u8fc7\u7a0b\u6216\u51fd\u6570\u4e2d\u8c03\u7528\u3002<\/p>\n\n\n\n<p>SQL \u4e2d\u7684\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u53ef\u91cd\u7528\u6027\uff1a\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u53ef\u4ee5\u5728\u591a\u4e2a\u67e5\u8be2\u6216\u5e94\u7528\u7a0b\u5e8f\u4e2d\u4f7f\u7528\uff0c\u51cf\u5c11\u4e86\u4ee3\u7801\u7684\u91cd\u590d\u7f16\u5199\u548c\u7ef4\u62a4\u5de5\u4f5c\u3002<\/li>\n\n\n\n<li>\u63d0\u9ad8\u6027\u80fd\uff1a\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u662f\u9884\u7f16\u8bd1\u7684\uff0c\u56e0\u6b64\u6267\u884c\u901f\u5ea6\u901a\u5e38\u6bd4\u4e00\u822c\u7684 SQL \u67e5\u8be2\u8bed\u53e5\u8981\u5feb\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u5b89\u5168\u6027\uff1a\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u53ef\u4ee5\u63a7\u5236\u5bf9\u6570\u636e\u5e93\u7684\u8bbf\u95ee\u6743\u9650\uff0c\u4ece\u800c\u4fdd\u62a4\u6570\u636e\u5e93\u4e2d\u7684\u654f\u611f\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u7ba1\u7406\u65b9\u4fbf\uff1a\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u53ef\u4ee5\u901a\u8fc7 ALTER\u3001CREATE \u548c DROP \u7b49\u8bed\u53e5\u8fdb\u884c\u7ba1\u7406\u548c\u7ef4\u62a4\u3002<\/li>\n<\/ol>\n\n\n\n<p>SQL \u4e2d\u7684\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u7684\u8bed\u6cd5\u7c7b\u4f3c\uff0c\u901a\u5e38\u5305\u62ec\u4ee5\u4e0b\u90e8\u5206\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u521b\u5efa\uff1a\u4f7f\u7528 CREATE PROCEDURE \u6216 CREATE FUNCTION \u8bed\u53e5\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0b\u6216\u51fd\u6570\u3002<\/li>\n\n\n\n<li>\u53c2\u6570\uff1a\u6307\u5b9a\u5b58\u50a8\u8fc7\u7a0b\u6216\u51fd\u6570\u7684\u53c2\u6570\uff0c\u5305\u62ec\u53c2\u6570\u540d\u79f0\u3001\u6570\u636e\u7c7b\u578b\u3001\u8f93\u5165\/\u8f93\u51fa\u65b9\u5411\u7b49\u4fe1\u606f\u3002<\/li>\n\n\n\n<li>\u4ee3\u7801\u5757\uff1a\u5305\u542b\u4e00\u7cfb\u5217 SQL \u8bed\u53e5\uff0c\u53ef\u5bf9\u6570\u636e\u5e93\u8fdb\u884c\u64cd\u4f5c\u6216\u8fd4\u56de\u7ed3\u679c\u3002<\/li>\n\n\n\n<li>\u8c03\u7528\uff1a\u4f7f\u7528 EXECUTE \u6216 CALL \u8bed\u53e5\u6267\u884c\u5b58\u50a8\u8fc7\u7a0b\u6216\u51fd\u6570\uff0c\u5e76\u4f20\u9012\u53c2\u6570\u3002<\/li>\n\n\n\n<li>\u5220\u9664\uff1a\u4f7f\u7528 DROP PROCEDURE \u6216 DROP FUNCTION \u8bed\u53e5\u5220\u9664\u5b58\u50a8\u8fc7\u7a0b\u6216\u51fd\u6570\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u901a\u5e38\u7528\u4e8e\u4ee5\u4e0b\u573a\u666f\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6570\u636e\u5e93\u7ba1\u7406\uff1a\u4f8b\u5982\u5907\u4efd\u548c\u8fd8\u539f\u6570\u636e\u5e93\u3001\u521b\u5efa\u548c\u5220\u9664\u8868\u3001\u7ba1\u7406\u7d22\u5f15\u7b49\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u64cd\u4f5c\uff1a\u4f8b\u5982\u63d2\u5165\u3001\u66f4\u65b0\u548c\u5220\u9664\u6570\u636e\u3001\u67e5\u8be2\u6570\u636e\u7b49\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u9a8c\u8bc1\u548c\u5904\u7406\uff1a\u4f8b\u5982\u9a8c\u8bc1\u7528\u6237\u8f93\u5165\u3001\u683c\u5f0f\u5316\u6570\u636e\u3001\u8ba1\u7b97\u6570\u636e\u7b49\u3002<\/li>\n\n\n\n<li>\u4e1a\u52a1\u903b\u8f91\u5904\u7406\uff1a\u4f8b\u5982\u8ba1\u7b97\u62a5\u8868\u3001\u6267\u884c\u4e8b\u52a1\u7b49\u3002<\/li>\n<\/ol>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u6709\u54ea\u4e9b\u5e38\u7528\u7684\u5546\u7528\u548c\u5f00\u6e90\u7684\u6570\u636e\u5e93\u652f\u6301\u6807\u51c6SQL<\/p>\n\n\n\n<p>\u6709\u5f88\u591a\u5546\u7528\u548c\u5f00\u6e90\u7684\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u652f\u6301\u6807\u51c6SQL\uff0c\u4e0b\u9762\u5217\u51fa\u4e00\u4e9b\u5e38\u7528\u7684\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Oracle\uff1a\u5546\u7528\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u652f\u6301SQL92\u548cSQL99\u6807\u51c6\u4ee5\u53ca\u4e00\u4e9b\u6269\u5c55\u3002<\/li>\n\n\n\n<li>Microsoft SQL Server\uff1a\u5546\u7528\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u652f\u6301SQL92\u6807\u51c6\u4ee5\u53ca\u4e00\u4e9b\u6269\u5c55\u3002<\/li>\n\n\n\n<li>IBM Db2\uff1a\u5546\u7528\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u652f\u6301SQL92\u548cSQL99\u6807\u51c6\u4ee5\u53ca\u4e00\u4e9b\u6269\u5c55\u3002<\/li>\n\n\n\n<li>MySQL\uff1a\u5f00\u6e90\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u652f\u6301SQL92\u548cSQL99\u6807\u51c6\u4ee5\u53ca\u4e00\u4e9b\u6269\u5c55\u3002<\/li>\n\n\n\n<li>PostgreSQL\uff1a\u5f00\u6e90\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u652f\u6301SQL92\u548cSQL99\u6807\u51c6\u4ee5\u53ca\u4e00\u4e9b\u6269\u5c55\u3002<\/li>\n\n\n\n<li>SQLite\uff1a\u5f00\u6e90\u5d4c\u5165\u5f0f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u652f\u6301SQL92\u6807\u51c6\u3002<\/li>\n\n\n\n<li>MariaDB\uff1a\u5f00\u6e90\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u662fMySQL\u7684\u5206\u652f\uff0c\u652f\u6301SQL92\u548cSQL99\u6807\u51c6\u4ee5\u53ca\u4e00\u4e9b\u6269\u5c55\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u8fd9\u4e9b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u90fd\u652f\u6301\u6807\u51c6\u7684SQL\u8bed\u8a00\uff0c\u4f46\u53ef\u80fd\u4f1a\u6709\u4e00\u4e9b\u5dee\u5f02\u6216\u6269\u5c55\u3002\u6b64\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4e13\u95e8\u4e3a\u67d0\u4e9b\u7279\u5b9a\u5e94\u7528\u573a\u666f\u8fdb\u884c\u4e86\u4f18\u5316\uff0c\u4f8b\u5982\u5927\u6570\u636e\u5904\u7406\u6216\u5d4c\u5165\u5f0f\u8bbe\u5907\uff0c\u8fd9\u4e9b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u53ef\u80fd\u652f\u6301\u66f4\u591a\u7684SQL\u6269\u5c55\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u4e2d\u7684\u4e8b\u52a1\u5904\u7406<\/p>\n\n\n\n<p>\u4e8b\u52a1\u5904\u7406\u662fSQL\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u6982\u5ff5\u4e4b\u4e00\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u5c06\u591a\u4e2a\u6570\u636e\u5e93\u64cd\u4f5c\u7ec4\u5408\u6210\u4e00\u4e2a\u903b\u8f91\u5355\u5143\u7684\u65b9\u5f0f\uff0c\u4f7f\u5f97\u8fd9\u4e9b\u64cd\u4f5c\u8981\u4e48\u5168\u90e8\u6267\u884c\u6210\u529f\uff0c\u8981\u4e48\u5168\u90e8\u6267\u884c\u5931\u8d25\u5e76\u56de\u6eda\u5230\u4e4b\u524d\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n<p>\u4e8b\u52a1\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u4e2a\u64cd\u4f5c\u5e8f\u5217\uff0c\u8fd9\u4e9b\u64cd\u4f5c\u88ab\u4f5c\u4e3a\u4e00\u4e2a\u5355\u72ec\u7684\u5de5\u4f5c\u5355\u5143\u6765\u6267\u884c\u3002\u8fd9\u4e9b\u64cd\u4f5c\u53ef\u80fd\u5305\u62ec\u63d2\u5165\u3001\u66f4\u65b0\u548c\u5220\u9664\u6570\u636e\u7b49\u6570\u636e\u5e93\u64cd\u4f5c\u3002\u5728\u4e00\u4e2a\u4e8b\u52a1\u4e2d\uff0c\u8fd9\u4e9b\u64cd\u4f5c\u5fc5\u987b\u6309\u7167\u7279\u5b9a\u7684\u987a\u5e8f\u6267\u884c\uff0c\u4ee5\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u5982\u679c\u5728\u6267\u884c\u4e8b\u52a1\u8fc7\u7a0b\u4e2d\u51fa\u73b0\u9519\u8bef\uff0c\u6574\u4e2a\u4e8b\u52a1\u5c06\u4f1a\u88ab\u56de\u6eda\uff0c\u4f7f\u5f97\u6240\u6709\u4fee\u6539\u90fd\u88ab\u64a4\u9500\uff0c\u6570\u636e\u5e93\u56de\u5230\u4e8b\u52a1\u6267\u884c\u4e4b\u524d\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0c\u4e8b\u52a1\u7684\u5904\u7406\u901a\u8fc7\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\u6765\u5b9e\u73b0\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>BEGIN TRANSACTION\uff1a\u5f00\u59cb\u4e00\u4e2a\u65b0\u4e8b\u52a1\u3002<\/li>\n\n\n\n<li>COMMIT\uff1a\u63d0\u4ea4\u5f53\u524d\u4e8b\u52a1\u5e76\u5c06\u5176\u4fdd\u5b58\u5230\u6570\u636e\u5e93\u4e2d\u3002<\/li>\n\n\n\n<li>ROLLBACK\uff1a\u64a4\u9500\u5f53\u524d\u4e8b\u52a1\u4e2d\u7684\u6240\u6709\u66f4\u6539\u5e76\u56de\u6eda\u5230\u4e4b\u524d\u7684\u72b6\u6001\u3002<\/li>\n\n\n\n<li>SAVEPOINT\uff1a\u4e3a\u4e8b\u52a1\u8bbe\u7f6e\u4e00\u4e2a\u4fdd\u5b58\u70b9\uff0c\u53ef\u4ee5\u5728\u540e\u7eed\u64cd\u4f5c\u4e2d\u56de\u6eda\u5230\u8be5\u4fdd\u5b58\u70b9\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u4e8b\u52a1\u5904\u7406\u5bf9\u4e8e\u4fdd\u8bc1\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u975e\u5e38\u91cd\u8981\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u6d89\u53ca\u591a\u4e2a\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u590d\u6742\u4efb\u52a1\u65f6\u3002\u5b83\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u6b63\u786e\u6027\uff0c\u5e76\u4e14\u5141\u8bb8\u6570\u636e\u5e93\u6062\u590d\u5230\u6700\u8fd1\u7684\u4e00\u81f4\u72b6\u6001\uff0c\u4ece\u800c\u907f\u514d\u4e86\u6570\u636e\u4e22\u5931\u6216\u635f\u574f\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91ca\u6570\u636e\u5e93\u4e2d\u7684\u8fde\u63a5\u5b57\u7b26\u4e32<\/p>\n\n\n\n<p>\u6570\u636e\u5e93\u8fde\u63a5\u5b57\u7b26\u4e32\u662f\u4e00\u79cd\u5305\u542b\u6709\u5173\u5982\u4f55\u8fde\u63a5\u5230\u6570\u636e\u5e93\u7684\u4fe1\u606f\u7684\u5b57\u7b26\u4e32\u3002\u901a\u5e38\u5305\u62ec\u6570\u636e\u6e90\uff08\u4f8b\u5982\u6570\u636e\u5e93\u670d\u52a1\u5668\u7684\u540d\u79f0\u6216IP\u5730\u5740\uff09\uff0c\u8eab\u4efd\u9a8c\u8bc1\u4fe1\u606f\uff08\u4f8b\u5982\u7528\u6237\u540d\u548c\u5bc6\u7801\uff09\uff0c\u4ee5\u53ca\u5176\u4ed6\u8fde\u63a5\u53c2\u6570\uff08\u4f8b\u5982\u8fde\u63a5\u8d85\u65f6\u548c\u5b57\u7b26\u96c6\uff09\u3002\u8fde\u63a5\u5b57\u7b26\u4e32\u662f\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\u914d\u7f6e\u7684\uff0c\u4ee5\u4fbf\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u8bbf\u95ee\u6570\u636e\u5e93\u3002<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0c\u8fde\u63a5\u5b57\u7b26\u4e32\u901a\u5e38\u7528\u4e8e\u8fde\u63a5\u5230\u8fdc\u7a0b\u6570\u636e\u5e93\u670d\u52a1\u5668\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u662f\u8fde\u63a5\u5230MySQL\u6570\u636e\u5e93\u7684\u8fde\u63a5\u5b57\u7b26\u4e32\u793a\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">arduinoCopy code<code>Server=myServerAddress;Port=1234;Database=myDataBase;Uid=myUsername;Pwd=myPassword;\n<\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff0c<code>myServerAddress<\/code> \u662f\u6570\u636e\u5e93\u670d\u52a1\u5668\u7684\u540d\u79f0\u6216IP\u5730\u5740\uff0c<code>1234<\/code> \u662f\u6570\u636e\u5e93\u670d\u52a1\u5668\u7684\u7aef\u53e3\u53f7\uff0c<code>myDataBase<\/code> \u662f\u8981\u8fde\u63a5\u7684\u6570\u636e\u5e93\u540d\u79f0\uff0c<code>myUsername<\/code> \u548c <code>myPassword<\/code> \u662f\u8fde\u63a5\u5230\u6570\u636e\u5e93\u6240\u9700\u7684\u7528\u6237\u540d\u548c\u5bc6\u7801\u3002<\/p>\n\n\n\n<p>\u8fde\u63a5\u5b57\u7b26\u4e32\u53ef\u4ee5\u6839\u636e\u4e0d\u540c\u7684\u6570\u636e\u5e93\u548c\u5e94\u7528\u7a0b\u5e8f\u8fdb\u884c\u5b9a\u5236\u3002\u4e0d\u540c\u7684\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08DBMS\uff09\u53ef\u4ee5\u4f7f\u7528\u4e0d\u540c\u7684\u8fde\u63a5\u5b57\u7b26\u4e32\u683c\u5f0f\u548c\u53c2\u6570\u3002\u56e0\u6b64\uff0c\u4e86\u89e3\u5982\u4f55\u914d\u7f6e\u6b63\u786e\u7684\u8fde\u63a5\u5b57\u7b26\u4e32\u975e\u5e38\u91cd\u8981\uff0c\u4ee5\u786e\u4fdd\u5e94\u7528\u7a0b\u5e8f\u80fd\u591f\u6b63\u786e\u8fde\u63a5\u5230\u6570\u636e\u5e93\u5e76\u8bbf\u95ee\u6570\u636e\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u4e2dIN\u7684\u7528\u6cd5<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0c<code>IN<\/code> \u662f\u4e00\u4e2a\u64cd\u4f5c\u7b26\uff0c\u7528\u4e8e\u5728 <code>WHERE<\/code> \u5b50\u53e5\u4e2d\u6307\u5b9a\u4e00\u4e2a\u6761\u4ef6\uff0c\u4ee5\u4fbf\u5728\u67e5\u8be2\u7ed3\u679c\u4e2d\u8fd4\u56de\u5339\u914d\u6761\u4ef6\u7684\u884c\u3002<\/p>\n\n\n\n<p><code>IN<\/code> \u64cd\u4f5c\u7b26\u53ef\u4ee5\u7528\u6765\u6d4b\u8bd5\u67d0\u4e2a\u503c\u662f\u5426\u5728\u4e00\u7ec4\u503c\u4e2d\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0bSQL\u8bed\u53e5\u5c06\u8fd4\u56de <code>orders<\/code> \u8868\u4e2d\u5ba2\u6237\u4e3aAlice\u3001Bob\u6216Charlie\u7684\u6240\u6709\u8ba2\u5355\u8bb0\u5f55\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT * FROM orders\nWHERE customer_name IN ('Alice', 'Bob', 'Charlie');\n<\/code><\/pre>\n\n\n\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c<code>IN<\/code> \u64cd\u4f5c\u7b26\u7528\u4e8e\u6307\u5b9a\u8981\u5339\u914d\u7684\u503c\u7684\u5217\u8868\uff0c\u5217\u8868\u4f7f\u7528\u5706\u62ec\u53f7\u62ec\u8d77\u6765\uff0c\u5e76\u7528\u9017\u53f7\u5206\u9694\u6bcf\u4e2a\u503c\u3002\u67e5\u8be2\u7ed3\u679c\u5c06\u5305\u542b <code>orders<\/code> \u8868\u4e2d\u5ba2\u6237\u540d\u79f0\u4e3a <code>Alice<\/code>\u3001<code>Bob<\/code> \u6216 <code>Charlie<\/code> \u7684\u6240\u6709\u8ba2\u5355\u8bb0\u5f55\u3002<\/p>\n\n\n\n<p><code>IN<\/code> \u64cd\u4f5c\u7b26\u8fd8\u53ef\u4ee5\u4e0e\u5b50\u67e5\u8be2\u7ed3\u5408\u4f7f\u7528\uff0c\u4ee5\u4fbf\u6839\u636e\u53e6\u4e00\u4e2a\u67e5\u8be2\u7684\u7ed3\u679c\u8fc7\u6ee4\u7ed3\u679c\u96c6\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0bSQL\u8bed\u53e5\u5c06\u8fd4\u56de\u5177\u6709\u81f3\u5c11\u4e00\u4e2a\u8ba2\u5355\u7684\u6240\u6709\u5ba2\u6237\u540d\u79f0\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT * FROM customers\nWHERE customer_id IN (SELECT customer_id FROM orders);\n<\/code><\/pre>\n\n\n\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c<code>IN<\/code> \u64cd\u4f5c\u7b26\u7528\u4e8e\u6307\u5b9a\u4e00\u4e2a\u5b50\u67e5\u8be2\uff0c\u8be5\u5b50\u67e5\u8be2\u8fd4\u56de <code>orders<\/code> \u8868\u4e2d\u5b58\u5728\u7684\u6240\u6709\u5ba2\u6237 ID\u3002\u4e3b\u67e5\u8be2\u5c06\u8fd4\u56de <code>customers<\/code> \u8868\u4e2d\u5177\u6709\u4e0e\u5b50\u67e5\u8be2\u7ed3\u679c\u5339\u914d\u7684\u5ba2\u6237 ID \u7684\u6240\u6709\u8bb0\u5f55\u3002<\/p>\n\n\n\n<p>\u603b\u4e4b\uff0c<code>IN<\/code> \u64cd\u4f5c\u7b26\u662f\u4e00\u79cd\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u7528\u6765\u6d4b\u8bd5\u4e00\u4e2a\u503c\u662f\u5426\u5728\u4e00\u7ec4\u503c\u6216\u5b50\u67e5\u8be2\u7684\u7ed3\u679c\u4e2d\uff0c\u5e76\u5728\u67e5\u8be2\u7ed3\u679c\u4e2d\u8fd4\u56de\u5339\u914d\u7684\u8bb0\u5f55\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u4e2d\u7684\u901a\u914d\u7b26<\/p>\n\n\n\n<p>SQL\u4e2d\u7684\u901a\u914d\u7b26\u662f\u7528\u6765\u5339\u914d\u5b57\u7b26\u6216\u8005\u6570\u5b57\u7684\u7279\u6b8a\u7b26\u53f7\u3002\u5e38\u7528\u7684\u901a\u914d\u7b26\u6709<code>%<\/code>\u548c<code>_<\/code>\uff0c\u4e0b\u9762\u5206\u522b\u8fdb\u884c\u8be6\u7ec6\u89e3\u91ca\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>%<\/code>\u901a\u914d\u7b26\uff1a\u8868\u793a\u4efb\u610f\u5b57\u7b26\uff0c\u53ef\u4ee5\u5339\u914d\u4efb\u610f\u957f\u5ea6\u7684\u5b57\u7b26\u4e32\u3002\u4f8b\u5982\uff0c\u4f7f\u7528<code>%<\/code>\u5339\u914d\u4ee5<code>a<\/code>\u5f00\u5934\u548c\u4ee5<code>a<\/code>\u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\uff1asqlCopy code<code>SELECT * FROM table_name WHERE column_name LIKE 'a%a'; <\/code>\u8fd9\u4e2a\u8bed\u53e5\u53ef\u4ee5\u5339\u914d<code>abcda<\/code>\u3001<code>a123a<\/code>\u7b49\u4ee5<code>a<\/code>\u5f00\u5934\u548c\u4ee5<code>a<\/code>\u7ed3\u5c3e\u7684\u4efb\u610f\u957f\u5ea6\u5b57\u7b26\u4e32\u3002<\/li>\n\n\n\n<li><code>_<\/code>\u901a\u914d\u7b26\uff1a\u8868\u793a\u5355\u4e2a\u5b57\u7b26\uff0c\u53ef\u4ee5\u5339\u914d\u5355\u4e2a\u4efb\u610f\u5b57\u7b26\u3002\u4f8b\u5982\uff0c\u4f7f\u7528<code>_<\/code>\u5339\u914d\u4ee5<code>a<\/code>\u5f00\u5934\u548c\u4ee5<code>a<\/code>\u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\uff1asqlCopy code<code>SELECT * FROM table_name WHERE column_name LIKE 'a_a'; <\/code>\u8fd9\u4e2a\u8bed\u53e5\u53ef\u4ee5\u5339\u914d<code>abcda<\/code>\u3001<code>axaa<\/code>\u7b49\u4ee5<code>a<\/code>\u5f00\u5934\u548c\u4ee5<code>a<\/code>\u7ed3\u5c3e\u7684\u957f\u5ea6\u4e3a3\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u901a\u914d\u7b26\u53ef\u4ee5\u4e0e<code>LIKE<\/code>\u64cd\u4f5c\u7b26\u4e00\u8d77\u4f7f\u7528\uff0c\u7528\u4e8e\u5728<code>WHERE<\/code>\u5b50\u53e5\u4e2d\u8fdb\u884c\u6a21\u7cca\u5339\u914d\u3002\u5728\u4f7f\u7528\u901a\u914d\u7b26\u65f6\u9700\u8981\u6ce8\u610f\uff0c\u5982\u679c\u5339\u914d\u7684\u5b57\u7b26\u4e32\u8fc7\u591a\uff0c\u4f1a\u5f71\u54cd\u67e5\u8be2\u6027\u80fd\uff1b\u800c\u4e14\u8fc7\u591a\u7684\u901a\u914d\u7b26\u4e5f\u4f1a\u5bfc\u81f4\u4e0d\u51c6\u786e\u7684\u67e5\u8be2\u7ed3\u679c\uff0c\u56e0\u6b64\u9700\u8981\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u5408\u7406\u4f7f\u7528\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u4e2d\u7684\u522b\u540d<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0c\u522b\u540d\u662f\u7528\u4e8e\u4e3a\u8868\u3001\u5217\u6216\u8868\u8fbe\u5f0f\u6307\u5b9a\u4e34\u65f6\u540d\u79f0\u7684\u8bed\u6cd5\u5143\u7d20\u3002\u522b\u540d\u53ef\u4ee5\u7b80\u5316\u590d\u6742\u7684\u67e5\u8be2\uff0c\u4f7f\u67e5\u8be2\u7ed3\u679c\u66f4\u5bb9\u6613\u7406\u89e3\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u522b\u540d\u53ef\u4ee5\u7528\u4e8e\u4ee5\u4e0b\u65b9\u9762\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u8868\u522b\u540d\uff1a\u4e3a\u8868\u6307\u5b9a\u4e00\u4e2a\u4e34\u65f6\u540d\u79f0\uff0c\u53ef\u4ee5\u901a\u8fc7\u8be5\u540d\u79f0\u6765\u5f15\u7528\u8868\u3002\u8fd9\u5728\u6d89\u53ca\u591a\u4e2a\u8868\u7684\u67e5\u8be2\u4e2d\u7279\u522b\u6709\u7528\u3002\u4f8b\u5982\uff1avbnetCopy code<code>SELECT e.emp_name, d.dept_name FROM employees AS e INNER JOIN departments AS d ON e.dept_id = d.dept_id; <\/code>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c&#8221;AS&#8221;\u5173\u952e\u5b57\u662f\u53ef\u9009\u7684\uff0c\u6211\u4eec\u4f7f\u7528&#8221;AS&#8221;\u5173\u952e\u5b57\u6765\u5c06&#8221;employees&#8221;\u8868\u548c&#8221;departments&#8221;\u8868\u5206\u522b\u547d\u540d\u4e3a&#8221;e&#8221;\u548c&#8221;d&#8221;\u3002<\/li>\n\n\n\n<li>\u5217\u522b\u540d\uff1a\u4e3a\u5217\u6307\u5b9a\u4e00\u4e2a\u4e34\u65f6\u540d\u79f0\uff0c\u53ef\u4ee5\u4f7f\u7528\u8be5\u540d\u79f0\u5f15\u7528\u5217\u3002\u8fd9\u5728\u67e5\u8be2\u4e2d\u4f7f\u7528\u51fd\u6570\u6216\u8ba1\u7b97\u5b57\u6bb5\u65f6\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff1avbnetCopy code<code>SELECT emp_name, salary * 0.1 AS bonus FROM employees; <\/code>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5c06&#8221;salary * 0.1&#8243;\u547d\u540d\u4e3a&#8221;bonus&#8221;\uff0c\u4ee5\u4fbf\u5728\u67e5\u8be2\u4e2d\u5f15\u7528\u5b83\u3002<\/li>\n\n\n\n<li>\u8868\u8fbe\u5f0f\u522b\u540d\uff1a\u4e3a\u8868\u8fbe\u5f0f\u6307\u5b9a\u4e00\u4e2a\u4e34\u65f6\u540d\u79f0\uff0c\u53ef\u4ee5\u4f7f\u7528\u8be5\u540d\u79f0\u5f15\u7528\u8868\u8fbe\u5f0f\u3002\u4f8b\u5982\uff1asqlCopy code<code>SELECT emp_name, CASE WHEN salary &gt;= 50000 THEN 'High' ELSE 'Low' END AS salary_range FROM employees; <\/code>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528CASE\u8868\u8fbe\u5f0f\u4e3a\u5de5\u8d44\u6307\u5b9a\u4e00\u4e2a\u8303\u56f4\uff0c\u5e76\u5c06\u5b83\u547d\u540d\u4e3a&#8221;salary_range&#8221;\uff0c\u4ee5\u4fbf\u5728\u67e5\u8be2\u4e2d\u5f15\u7528\u5b83\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u4f7f\u7528\u522b\u540d\u53ef\u4ee5\u4f7f\u67e5\u8be2\u66f4\u5bb9\u6613\u9605\u8bfb\u548c\u7406\u89e3\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u63d0\u4f9b\u66f4\u7b80\u6d01\u7684\u8bed\u6cd5\u548c\u66f4\u5177\u63cf\u8ff0\u6027\u7684\u540d\u79f0\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u4e2dUNION\u7684\u7528\u6cd5<\/p>\n\n\n\n<p>\u5728 SQL \u4e2d\uff0cUNION \u7528\u4e8e\u5c06\u4e24\u4e2a\u6216\u591a\u4e2a SELECT \u8bed\u53e5\u7684\u7ed3\u679c\u7ec4\u5408\u5230\u4e00\u4e2a\u7ed3\u679c\u96c6\u4e2d\u3002\u4f7f\u7528 UNION \u65f6\uff0c\u6bcf\u4e2a SELECT \u8bed\u53e5\u5fc5\u987b\u5177\u6709\u76f8\u540c\u7684\u5217\u6570\u548c\u76f8\u4f3c\u7684\u6570\u636e\u7c7b\u578b\uff0c\u4ee5\u786e\u4fdd\u5b83\u4eec\u53ef\u4ee5\u5408\u5e76\u5230\u4e00\u4e2a\u7ed3\u679c\u96c6\u4e2d\u3002<\/p>\n\n\n\n<p>UNION \u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT column1, column2, ... FROM table1\nUNION\nSELECT column1, column2, ... FROM table2;\n<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f\uff0c\u8fd9\u91cc\u7684 SELECT \u8bed\u53e5\u5fc5\u987b\u7528\u5706\u62ec\u53f7\u62ec\u8d77\u6765\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>(SELECT column1, column2, ... FROM table1)\nUNION\n(SELECT column1, column2, ... FROM table2);\n<\/code><\/pre>\n\n\n\n<p>UNION \u4f1a\u8fd4\u56de\u6240\u6709 SELECT \u8bed\u53e5\u7684\u7ed3\u679c\u96c6\u4e2d\u552f\u4e00\u7684\u884c\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4f1a\u81ea\u52a8\u53bb\u91cd\u3002\u5982\u679c\u8981\u8fd4\u56de\u6240\u6709\u7684\u884c\uff0c\u5305\u62ec\u91cd\u590d\u7684\u884c\uff0c\u53ef\u4ee5\u4f7f\u7528 UNION ALL\u3002<\/p>\n\n\n\n<p>\u9664\u4e86 UNION \u548c UNION ALL\uff0cSQL \u8fd8\u652f\u6301\u5176\u4ed6\u7c7b\u578b\u7684\u96c6\u5408\u8fd0\u7b97\u7b26\uff0c\u4f8b\u5982 INTERSECT \u548c EXCEPT\uff0c\u4f46\u5e76\u975e\u6240\u6709\u7684\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u90fd\u652f\u6301\u8fd9\u4e9b\u8fd0\u7b97\u7b26\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u4e2d\u7ea6\u675f\u7684\u542b\u4e49<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0c\u7ea6\u675f\u662f\u7528\u4e8e\u9650\u5236\u8868\u4e2d\u6570\u636e\u7684\u89c4\u5219\u3002\u8fd9\u4e9b\u89c4\u5219\u53ef\u786e\u4fdd\u8868\u4e2d\u6570\u636e\u7684\u6709\u6548\u6027\u548c\u5b8c\u6574\u6027\uff0c\u5e76\u4e14\u9075\u5faa\u6570\u636e\u5e93\u7684\u8bbe\u8ba1\u6807\u51c6\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662fSQL\u4e2d\u7684\u4e00\u4e9b\u5e38\u89c1\u7ea6\u675f\u7c7b\u578b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4e3b\u952e\u7ea6\u675f\uff08Primary Key Constraint\uff09: \u4e3b\u952e\u662f\u7528\u6765\u552f\u4e00\u6807\u8bc6\u8868\u4e2d\u8bb0\u5f55\u7684\u5217\uff0c\u6bcf\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u4e3b\u952e\u3002\u4e3b\u952e\u5fc5\u987b\u5177\u6709\u552f\u4e00\u6027\uff0c\u4e0d\u80fd\u4e3a\u7a7a\uff0c\u53ef\u4ee5\u4f5c\u4e3a\u5176\u4ed6\u8868\u4e2d\u5916\u952e\u7684\u5f15\u7528\u3002\u4e3b\u952e\u7ea6\u675f\u53ef\u4ee5\u786e\u4fdd\u8868\u4e2d\u6bcf\u4e2a\u8bb0\u5f55\u90fd\u6709\u552f\u4e00\u7684\u6807\u8bc6\u7b26\u3002<\/li>\n\n\n\n<li>\u5916\u952e\u7ea6\u675f\uff08Foreign Key Constraint\uff09: \u5916\u952e\u7528\u4e8e\u5b9a\u4e49\u4e24\u4e2a\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u901a\u5e38\u7528\u4e8e\u5c06\u4e24\u4e2a\u8868\u8fde\u63a5\u8d77\u6765\u3002\u5916\u952e\u7ea6\u675f\u53ef\u4ee5\u786e\u4fdd\u5728\u4e00\u4e2a\u8868\u4e2d\u7684\u6570\u636e\u5728\u53e6\u4e00\u4e2a\u8868\u4e2d\u6709\u5bf9\u5e94\u7684\u6570\u636e\u3002\u5916\u952e\u5fc5\u987b\u5f15\u7528\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u4e3b\u952e\u6216\u552f\u4e00\u952e\u3002<\/li>\n\n\n\n<li>\u552f\u4e00\u7ea6\u675f\uff08Unique Constraint\uff09: \u552f\u4e00\u7ea6\u675f\u7528\u4e8e\u786e\u4fdd\u67d0\u4e2a\u5217\u6216\u4e00\u7ec4\u5217\u4e2d\u7684\u503c\u552f\u4e00\u3002\u4e0e\u4e3b\u952e\u4e0d\u540c\u7684\u662f\uff0c\u552f\u4e00\u7ea6\u675f\u53ef\u4ee5\u5141\u8bb8\u7a7a\u503c\u3002<\/li>\n\n\n\n<li>\u68c0\u67e5\u7ea6\u675f\uff08Check Constraint\uff09: \u68c0\u67e5\u7ea6\u675f\u7528\u4e8e\u9650\u5236\u67d0\u4e2a\u5217\u4e2d\u7684\u503c\u5fc5\u987b\u6ee1\u8db3\u67d0\u79cd\u6761\u4ef6\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u68c0\u67e5\u7ea6\u675f\uff0c\u786e\u4fdd\u65e5\u671f\u5217\u4e2d\u7684\u503c\u5927\u4e8e\u67d0\u4e2a\u65e5\u671f\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u9664\u4e86\u4e0a\u8ff0\u5e38\u89c1\u7ea6\u675f\u7c7b\u578b\u5916\uff0c\u8fd8\u6709\u5176\u4ed6\u7c7b\u578b\u7684\u7ea6\u675f\uff0c\u4f8b\u5982NOT NULL\u7ea6\u675f\uff08\u786e\u4fdd\u67d0\u4e2a\u5217\u4e2d\u6ca1\u6709\u7a7a\u503c\uff09\u3001DEFAULT\u7ea6\u675f\uff08\u5728\u5217\u4e2d\u63d2\u5165\u6570\u636e\u65f6\u5982\u679c\u672a\u6307\u5b9a\u503c\uff0c\u5219\u9ed8\u8ba4\u503c\u4e3a\u6307\u5b9a\u7684\u503c\uff09\u7b49\u3002<\/p>\n\n\n\n<p>\u5728\u521b\u5efa\u8868\u65f6\uff0c\u53ef\u4ee5\u4e3a\u5217\u5b9a\u4e49\u7ea6\u675f\u3002\u5982\u679c\u5c1d\u8bd5\u5411\u8868\u4e2d\u63d2\u5165\u4e0d\u7b26\u5408\u7ea6\u675f\u6761\u4ef6\u7684\u6570\u636e\uff0c\u5219\u4f1a\u5f15\u53d1\u9519\u8bef\u3002\u56e0\u6b64\uff0c\u7ea6\u675f\u5728\u786e\u4fdd\u6570\u636e\u7684\u6709\u6548\u6027\u548c\u5b8c\u6574\u6027\u65b9\u9762\u8d77\u7740\u91cd\u8981\u4f5c\u7528\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u4e2dNULL\u7684\u542b\u4e49<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0cNULL\u8868\u793a\u7f3a\u5931\u6216\u672a\u77e5\u7684\u503c\u3002\u5b83\u4e0d\u662f\u7a7a\u5b57\u7b26\u4e32\u3001\u96f6\u6216\u4efb\u4f55\u5176\u4ed6\u503c\uff0c\u800c\u662f\u8868\u793a\u7f3a\u5931\u7684\u503c\u3002\u5f53\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u884c\u7f3a\u5c11\u67d0\u4e2a\u7279\u5b9a\u7684\u503c\u65f6\uff0cNULL\u5c31\u4f1a\u88ab\u8d4b\u7ed9\u5b83\u3002<\/p>\n\n\n\n<p>NULL\u53ef\u4ee5\u51fa\u73b0\u5728\u4efb\u4f55\u6570\u636e\u7c7b\u578b\u4e2d\uff0c\u5305\u62ec\u5b57\u7b26\u4e32\u3001\u6570\u5b57\u3001\u65e5\u671f\u7b49\u3002\u5f53NULL\u51fa\u73b0\u5728WHERE\u5b50\u53e5\u4e2d\u65f6\uff0c\u5b83\u901a\u5e38\u4f1a\u5bfc\u81f4\u8fd9\u4e2a\u6761\u4ef6\u88ab\u89c6\u4e3a\u4e0d\u6210\u7acb\u3002\u56e0\u6b64\uff0c\u5728\u67e5\u8be2\u65f6\u9700\u8981\u5c0f\u5fc3\u5904\u7406NULL\u503c\u3002<\/p>\n\n\n\n<p>\u53e6\u5916\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cNULL\u4e0d\u7b49\u4e8e\u4efb\u4f55\u503c\uff0c\u5305\u62ecNULL\u672c\u8eab\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5728\u67e5\u8be2\u4e2d\u5224\u65ad\u4e00\u4e2a\u503c\u662f\u5426\u4e3aNULL\u65f6\uff0c\u9700\u8981\u4f7f\u7528IS NULL\u6216IS NOT NULL\u8fd0\u7b97\u7b26\uff0c\u800c\u4e0d\u662f\u7b49\u4e8e\u8fd0\u7b97\u7b26\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT * FROM mytable WHERE column1 IS NULL;\nSELECT * FROM mytable WHERE column1 IS NOT NULL;\n<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684\u67e5\u8be2\u4f1a\u8fd4\u56de\u6240\u6709column1\u4e3aNULL\u6216\u4e0d\u4e3aNULL\u7684\u884c\uff0c\u800c\u4e0d\u4f1a\u8fd4\u56decolumn1\u7b49\u4e8e\u4efb\u4f55\u5176\u4ed6\u503c\u7684\u884c\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u4e2d\u5982\u4f55\u5b9e\u73b0\u81ea\u52a8\u589e\u957f\u5b57\u6bb5\u8d4b\u503c<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0c\u81ea\u52a8\u589e\u957f\u5b57\u6bb5\u662f\u6307\u4e00\u4e2a\u8868\u4e2d\u5177\u6709\u552f\u4e00\u6027\u4e14\u9012\u589e\u7684\u6574\u6570\u503c\uff0c\u8fd9\u4e2a\u503c\u4f1a\u968f\u7740\u6bcf\u6b21\u6dfb\u52a0\u65b0\u8bb0\u5f55\u800c\u81ea\u52a8\u589e\u52a0\u3002\u5e38\u89c1\u7684\u81ea\u52a8\u589e\u957f\u5b57\u6bb5\u6709MySQL\u4e2d\u7684AUTO_INCREMENT\u548cOracle\u4e2d\u7684SEQUENCE\u3002<\/p>\n\n\n\n<p>\u5b9e\u73b0\u81ea\u52a8\u589e\u957f\u5b57\u6bb5\u8d4b\u503c\u9700\u8981\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5b9a\u4e49\u81ea\u52a8\u589e\u957f\u5b57\u6bb5\uff1a\u5728\u521b\u5efa\u8868\u65f6\uff0c\u9700\u8981\u5b9a\u4e49\u4e00\u4e2a\u81ea\u52a8\u589e\u957f\u5b57\u6bb5\uff0c\u5e76\u6307\u5b9a\u5176\u6570\u636e\u7c7b\u578b\u4e3a\u6574\u6570\u7c7b\u578b\uff0c\u4f8b\u5982\u5728MySQL\u4e2d\u53ef\u4ee5\u4f7f\u7528INT\u6216BIGINT\uff0c\u540c\u65f6\u9700\u8981\u6307\u5b9a\u8be5\u5b57\u6bb5\u4e3a\u4e3b\u952e\u6216\u552f\u4e00\u6027\u7ea6\u675f\u3002<\/li>\n\n\n\n<li>\u63d2\u5165\u6570\u636e\uff1a\u5728\u63d2\u5165\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u4e0d\u6307\u5b9a\u81ea\u52a8\u589e\u957f\u5b57\u6bb5\u7684\u503c\uff0c\u6570\u636e\u5e93\u4f1a\u81ea\u52a8\u4e3a\u8be5\u5b57\u6bb5\u5206\u914d\u4e00\u4e2a\u552f\u4e00\u7684\u9012\u589e\u503c\u3002<\/li>\n\n\n\n<li>\u83b7\u53d6\u81ea\u52a8\u589e\u957f\u5b57\u6bb5\u7684\u503c\uff1a\u5728\u63d2\u5165\u8bb0\u5f55\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528LAST_INSERT_ID()\u51fd\u6570\u83b7\u53d6\u81ea\u52a8\u589e\u957f\u5b57\u6bb5\u7684\u503c\u3002\u8be5\u51fd\u6570\u8fd4\u56de\u6700\u540e\u4e00\u6b21\u63d2\u5165\u8bb0\u5f55\u65f6\u81ea\u52a8\u589e\u957f\u5b57\u6bb5\u7684\u503c\uff0c\u4f8b\u5982\u5728MySQL\u4e2d\u53ef\u4ee5\u4f7f\u7528SELECT LAST_INSERT_ID()\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u591a\u7ebf\u7a0b\u6216\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u81ea\u52a8\u589e\u957f\u5b57\u6bb5\u7684\u552f\u4e00\u6027\u9700\u8981\u7279\u522b\u5173\u6ce8\uff0c\u5426\u5219\u53ef\u80fd\u51fa\u73b0\u6570\u636e\u51b2\u7a81\u7684\u60c5\u51b5\u3002\u53ef\u4ee5\u4f7f\u7528\u9501\u673a\u5236\u6216\u5206\u5e03\u5f0f\u7b97\u6cd5\u6765\u786e\u4fdd\u81ea\u52a8\u589e\u957f\u5b57\u6bb5\u7684\u552f\u4e00\u6027\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u8be6\u7ec6\u89e3\u91caSQL\u4e2d\u5982\u4f55\u521b\u5efa\u5927\u91cf\u6d4b\u8bd5\u6570\u636e<\/p>\n\n\n\n<p>\u5728SQL\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\u6765\u521b\u5efa\u5927\u91cf\u6d4b\u8bd5\u6570\u636e\uff0c\u5176\u4e2d\u4e00\u4e9b\u5e38\u7528\u7684\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4f7f\u7528INSERT INTO\u8bed\u53e5\u63d2\u5165\u591a\u884c\u6570\u636e\uff1a\u53ef\u4ee5\u4f7f\u7528INSERT INTO\u8bed\u53e5\u63d2\u5165\u591a\u884c\u6570\u636e\u6765\u521b\u5efa\u6d4b\u8bd5\u6570\u636e\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>INSERT INTO mytable (column1, column2, column3) \nVALUES \n  ('value1', 'value2', 'value3'), \n  ('value4', 'value5', 'value6'),\n  ('value7', 'value8', 'value9');\n<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>\u4f7f\u7528SELECT INTO\u8bed\u53e5\u590d\u5236\u6570\u636e\uff1a\u53ef\u4ee5\u4f7f\u7528SELECT INTO\u8bed\u53e5\u4ece\u73b0\u6709\u8868\u4e2d\u590d\u5236\u6570\u636e\u6765\u521b\u5efa\u6d4b\u8bd5\u6570\u636e\u3002\u4f8b\u5982\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>SELECT * INTO mytable_copy FROM mytable;\n<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>\u4f7f\u7528\u751f\u6210\u5668\u51fd\u6570\u751f\u6210\u6570\u636e\uff1a\u4e00\u4e9b\u6570\u636e\u5e93\u7cfb\u7edf\u63d0\u4f9b\u4e86\u5185\u7f6e\u7684\u751f\u6210\u5668\u51fd\u6570\uff0c\u53ef\u4ee5\u7528\u4e8e\u751f\u6210\u968f\u673a\u6216\u987a\u5e8f\u6570\u636e\u3002\u4f8b\u5982\uff0c\u5728MySQL\u4e2d\u53ef\u4ee5\u4f7f\u7528RAND()\u51fd\u6570\u751f\u6210\u968f\u673a\u6570\uff0c\u4f8b\u5982\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-preformatted\">sqlCopy code<code>INSERT INTO mytable (column1, column2, column3)\nSELECT \n  CONCAT('value', num), \n  RAND(), \n  NOW() \nFROM \n  (SELECT 1 AS num UNION SELECT 2 UNION SELECT 3) AS nums;\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u5c06\u63d2\u5165\u4e09\u884c\u6570\u636e\uff0c\u5176\u4e2d\u6bcf\u884c\u7684\u7b2c\u4e00\u5217\u4e3a&#8217;value1&#8217;\u3001&#8217;value2&#8217;\u548c&#8217;value3&#8217;\uff0c\u7b2c\u4e8c\u5217\u4e3a\u968f\u673a\u6570\uff0c\u7b2c\u4e09\u5217\u4e3a\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"4\">\n<li>\u4f7f\u7528\u7b2c\u4e09\u65b9\u5de5\u5177\u751f\u6210\u6570\u636e\uff1a\u9664\u4e86\u4e0a\u8ff0\u65b9\u6cd5\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5404\u79cd\u7b2c\u4e09\u65b9\u5de5\u5177\u548c\u6846\u67b6\u6765\u751f\u6210\u5927\u91cf\u7684\u6d4b\u8bd5\u6570\u636e\uff0c\u4f8b\u5982Faker\u548cDataFactory\u7b49\u3002\u8fd9\u4e9b\u5de5\u5177\u53ef\u4ee5\u751f\u6210\u5404\u79cd\u7c7b\u578b\u7684\u6570\u636e\uff0c\u4f8b\u5982\u59d3\u540d\u3001\u5730\u5740\u3001\u7535\u5b50\u90ae\u4ef6\u5730\u5740\u3001\u65e5\u671f\u7b49\uff0c\u5e76\u53ef\u4ee5\u901a\u8fc7\u914d\u7f6e\u8fdb\u884c\u81ea\u5b9a\u4e49\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u521b\u5efa\u6d4b\u8bd5\u6570\u636e\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u6570\u636e\u7684\u7c7b\u578b\u3001\u8303\u56f4\u548c\u5b8c\u6574\u6027\uff0c\u4ee5\u786e\u4fdd\u751f\u6210\u7684\u6570\u636e\u4e0e\u5b9e\u9645\u5e94\u7528\u573a\u666f\u76f8\u7b26\u5e76\u80fd\u591f\u6210\u529f\u5730\u7528\u4e8e\u6d4b\u8bd5\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u5728\u7cfb\u7edf\u5f00\u53d1\u4e2d\u6709\u54ea\u4e9b\u5e38\u7528\u5de5\u5177\u6765\u8f85\u52a9\u6211\u4eec\u6267\u884c\u6216\u8c03\u8bd5SQL\u8bed\u53e5<\/p>\n\n\n\n<p>\u5728\u7cfb\u7edf\u5f00\u53d1\u4e2d\uff0c\u5e38\u7528\u7684\u5de5\u5177\u6765\u8f85\u52a9\u6267\u884c\u6216\u8c03\u8bd5SQL\u8bed\u53e5\u5305\u62ec\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>SQL\u7f16\u8f91\u5668\uff1a\u4f8b\u5982SQL Server Management Studio\u3001MySQL Workbench\u3001Oracle SQL Developer\u7b49\uff0c\u8fd9\u4e9b\u7f16\u8f91\u5668\u63d0\u4f9b\u4e86\u4e00\u4e2a\u56fe\u5f62\u5316\u754c\u9762\uff0c\u53ef\u4ee5\u7528\u6765\u7f16\u5199\u3001\u6267\u884c\u3001\u8c03\u8bd5SQL\u8bed\u53e5\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u5e93\u76d1\u89c6\u5de5\u5177\uff1a\u4f8b\u5982SQL Profiler\u3001MySQL Enterprise Monitor\u7b49\uff0c\u8fd9\u4e9b\u5de5\u5177\u53ef\u4ee5\u7528\u6765\u76d1\u89c6\u6570\u636e\u5e93\u7684\u6027\u80fd\u3001\u8ddf\u8e2a\u6570\u636e\u5e93\u64cd\u4f5c\uff0c\u4ee5\u53ca\u5206\u6790SQL\u67e5\u8be2\u7684\u6267\u884c\u8ba1\u5212\u7b49\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u5e93\u8c03\u8bd5\u5668\uff1a\u4f8b\u5982dbForge Studio\u3001Toad\u7b49\uff0c\u8fd9\u4e9b\u5de5\u5177\u53ef\u4ee5\u7528\u6765\u5728\u7a0b\u5e8f\u4e2d\u6267\u884cSQL\u8bed\u53e5\uff0c\u5e76\u53ef\u4ee5\u5355\u6b65\u6267\u884c\u3001\u65ad\u70b9\u8c03\u8bd5SQL\u4ee3\u7801\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u5e93\u6d4b\u8bd5\u5de5\u5177\uff1a\u4f8b\u5982SQLUnit\u3001DbFit\u7b49\uff0c\u8fd9\u4e9b\u5de5\u5177\u53ef\u4ee5\u7528\u6765\u7f16\u5199\u3001\u8fd0\u884c\u548c\u7ba1\u7406\u6570\u636e\u5e93\u7684\u5355\u5143\u6d4b\u8bd5\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u5e93\u6bd4\u8f83\u5de5\u5177\uff1a\u4f8b\u5982Red Gate SQL Compare\u3001ApexSQL Diff\u7b49\uff0c\u8fd9\u4e9b\u5de5\u5177\u53ef\u4ee5\u7528\u6765\u6bd4\u8f83\u4e24\u4e2a\u6570\u636e\u5e93\u7684\u7ed3\u6784\u548c\u6570\u636e\uff0c\u5e76\u751f\u6210\u5dee\u5f02\u62a5\u544a\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u5e93\u7248\u672c\u63a7\u5236\u5de5\u5177\uff1a\u4f8b\u5982Red Gate SQL Source Control\u3001dbForge Source Control\u7b49\uff0c\u8fd9\u4e9b\u5de5\u5177\u53ef\u4ee5\u7528\u6765\u7ba1\u7406\u6570\u636e\u5e93\u5bf9\u8c61\u7684\u7248\u672c\u63a7\u5236\uff0c\u4ee5\u53ca\u4e0e\u4ee3\u7801\u7248\u672c\u63a7\u5236\u7cfb\u7edf\u7684\u96c6\u6210\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u8fd9\u4e9b\u5de5\u5177\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u4eba\u5458\u66f4\u5feb\u901f\u3001\u9ad8\u6548\u5730\u5f00\u53d1\u3001\u6d4b\u8bd5\u3001\u8c03\u8bd5\u548c\u7ef4\u62a4\u6570\u636e\u5e93\u7cfb\u7edf\uff0c\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\u548c\u8f6f\u4ef6\u8d28\u91cf\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u6709\u54ea\u6570\u636e\u5e93\u53ef\u4ee5\u652f\u6301\u5927\u6570\u636e\u7684\u5b58\u50a8\u548c\u8bbf\u95ee<\/p>\n\n\n\n<p>\u6709\u8bb8\u591a\u6570\u636e\u5e93\u53ef\u4ee5\u652f\u6301\u5927\u6570\u636e\u7684\u5b58\u50a8\u548c\u8bbf\u95ee\u3002\u4ee5\u4e0b\u662f\u51e0\u4e2a\u5e38\u7528\u7684\u6570\u636e\u5e93\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Apache Hadoop\uff1aHadoop\u662f\u4e00\u4e2a\u5f00\u6e90\u6846\u67b6\uff0c\u652f\u6301\u5206\u5e03\u5f0f\u5b58\u50a8\u548c\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u96c6\u3002\u5b83\u5305\u62ecHDFS\uff08\u5206\u5e03\u5f0f\u6587\u4ef6\u7cfb\u7edf\uff09\u548cMapReduce\uff08\u5206\u5e03\u5f0f\u8ba1\u7b97\u6846\u67b6\uff09\u4e24\u4e2a\u7ec4\u4ef6\uff0c\u53ef\u4ee5\u7528\u6765\u5b58\u50a8\u548c\u5206\u6790\u5927\u6570\u636e\u3002<\/li>\n\n\n\n<li>Apache Cassandra\uff1aCassandra\u662f\u4e00\u4e2a\u9ad8\u5ea6\u53ef\u6269\u5c55\u7684\u5206\u5e03\u5f0f\u6570\u636e\u5e93\uff0c\u5177\u6709\u5206\u5e03\u5f0f\u5b58\u50a8\u548c\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u7684\u80fd\u529b\u3002\u5b83\u652f\u6301\u591a\u6570\u636e\u4e2d\u5fc3\u590d\u5236\u548c\u5bb9\u9519\u6027\uff0c\u9002\u7528\u4e8e\u9700\u8981\u9ad8\u6027\u80fd\u548c\u53ef\u6269\u5c55\u6027\u7684\u5927\u578b\u5e94\u7528\u7a0b\u5e8f\u3002<\/li>\n\n\n\n<li>MongoDB\uff1aMongoDB\u662f\u4e00\u4e2a\u57fa\u4e8e\u6587\u6863\u7684NoSQL\u6570\u636e\u5e93\uff0c\u652f\u6301\u9ad8\u5ea6\u53ef\u6269\u5c55\u7684\u5206\u5e03\u5f0f\u67b6\u6784\u3002\u5b83\u662f\u4e00\u4e2a\u9762\u5411\u6587\u6863\u7684\u6570\u636e\u5e93\uff0c\u53ef\u4ee5\u5b58\u50a8\u975e\u7ed3\u6784\u5316\u548c\u534a\u7ed3\u6784\u5316\u6570\u636e\u3002<\/li>\n\n\n\n<li>Apache Spark\uff1aSpark\u662f\u4e00\u4e2a\u5f00\u6e90\u7684\u5206\u5e03\u5f0f\u8ba1\u7b97\u6846\u67b6\uff0c\u7528\u4e8e\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u3002\u5b83\u652f\u6301\u5206\u5e03\u5f0f\u6570\u636e\u5904\u7406\u548c\u5206\u6790\uff0c\u53ef\u4ee5\u5904\u7406\u5305\u62ec\u7ed3\u6784\u5316\u3001\u534a\u7ed3\u6784\u5316\u548c\u975e\u7ed3\u6784\u5316\u6570\u636e\u5728\u5185\u7684\u5404\u79cd\u6570\u636e\u7c7b\u578b\u3002<\/li>\n\n\n\n<li>Amazon Web Services (AWS)\uff1aAWS\u63d0\u4f9b\u4e86\u591a\u79cd\u4e91\u670d\u52a1\uff0c\u5305\u62ecElastic MapReduce\uff08EMR\uff09\u3001Simple Storage Service\uff08S3\uff09\u548cRedshift\u7b49\uff0c\u7528\u4e8e\u5b58\u50a8\u548c\u5904\u7406\u5927\u6570\u636e\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u4ee5\u4e0a\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u6570\u636e\u5e93\uff0c\u4f46\u5e76\u4e0d\u662f\u6240\u6709\u652f\u6301\u5927\u6570\u636e\u5b58\u50a8\u548c\u8bbf\u95ee\u7684\u6570\u636e\u5e93\u3002\u5b9e\u9645\u4e0a\uff0c\u8bb8\u591a\u6570\u636e\u5e93\u90fd\u5177\u6709\u4e00\u5b9a\u7684\u53ef\u6269\u5c55\u6027\u548c\u5bb9\u9519\u6027\uff0c\u56e0\u6b64\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u9002\u5408\u7684\u6570\u636e\u5e93\u3002<\/p>\n\n\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/chat.openai.com\/_next\/image?url=https%3A%2F%2Flh3.googleusercontent.com%2Fa%2FAGNmyxbwVdnTP0E2eBqDrujRQjV-wFP12Thr4vFgysVv5A%3Ds96-c&amp;w=64&amp;q=75\" alt=\"gun tei\"\/><\/figure>\n\n\n\n<p>\u5728Github\u4e0a\u6709\u54ea\u4e9b\u5f88\u597d\u7684\u8d44\u6e90\u53ef\u4ee5\u8ba9\u6211\u4eec\u66f4\u597d\u7406\u89e3SQL<\/p>\n\n\n\n<p>\u5728Github\u4e0a\u6709\u8bb8\u591a\u5f00\u6e90\u9879\u76ee\u548c\u8d44\u6e90\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u66f4\u597d\u5730\u7406\u89e3\u548c\u5b66\u4e60SQL\uff0c\u4ee5\u4e0b\u662f\u5176\u4e2d\u4e00\u4e9b\u503c\u5f97\u63a8\u8350\u7684\u8d44\u6e90\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>SQLZoo\uff1a\u4e00\u4e2a\u57fa\u4e8e\u7f51\u9875\u7684SQL\u6559\u7a0b\uff0c\u9002\u5408\u521d\u5b66\u8005\uff0c\u63d0\u4f9b\u4e86\u4e92\u52a8\u5f0f\u7684\u7ec3\u4e60\uff0c\u53ef\u4ee5\u5728\u6d4f\u89c8\u5668\u4e2d\u76f4\u63a5\u8fdb\u884cSQL\u67e5\u8be2\u3002<\/li>\n\n\n\n<li>DB Fiddle\uff1a\u4e00\u4e2a\u5728\u7ebfSQL\u7f16\u8f91\u5668\uff0c\u652f\u6301\u591a\u79cd\u4e0d\u540c\u7684\u6570\u636e\u5e93\uff0c\u53ef\u4ee5\u7528\u4e8e\u7f16\u5199\u548c\u6d4b\u8bd5SQL\u67e5\u8be2\u3002<\/li>\n\n\n\n<li>SQL Style Guide\uff1a\u4e00\u4e2aSQL\u7f16\u7801\u98ce\u683c\u6307\u5357\uff0c\u6db5\u76d6\u4e86SQL\u7f16\u5199\u7684\u6700\u4f73\u5b9e\u8df5\u3001\u6837\u5f0f\u548c\u89c4\u8303\uff0c\u4ee5\u53caSQL\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/li>\n\n\n\n<li>SQL Cookbook\uff1a\u4e00\u4e2a\u6536\u96c6\u4e86\u8bb8\u591aSQL\u67e5\u8be2\u793a\u4f8b\u548c\u6280\u5de7\u7684\u9879\u76ee\uff0c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5feb\u901f\u89e3\u51b3\u5b9e\u9645\u95ee\u9898\u548c\u5e94\u7528\u573a\u666f\u3002<\/li>\n\n\n\n<li>sqlmap\uff1a\u4e00\u4e2a\u6d41\u884c\u7684SQL\u6ce8\u5165\u5de5\u5177\uff0c\u53ef\u4ee5\u6d4b\u8bd5\u548c\u8bc4\u4f30Web\u5e94\u7528\u7a0b\u5e8f\u7684\u5b89\u5168\u6027\uff0c\u5e76\u81ea\u52a8\u68c0\u6d4b\u548c\u5229\u7528SQL\u6ce8\u5165\u6f0f\u6d1e\u3002<\/li>\n\n\n\n<li>Awesome 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tei\"\/><\/figure>\n\n\n\n<p>\u8bf7\u5bf9\u4e0a\u8ff0\u77e5\u8bc6\u70b9\u505a\u4e00\u4e2a\u603b\u7ed3<\/p>\n\n\n\n<p>SQL\u662f\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff0c\u7528\u4e8e\u4e0e\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4ea4\u4e92\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5404\u79cd\u9886\u57df\uff0c\u5305\u62ec\u6570\u636e\u5206\u6790\u3001\u5546\u4e1a\u667a\u80fd\u3001\u6570\u636e\u79d1\u5b66\u548c\u4f01\u4e1a\u5e94\u7528\u7b49\u3002SQL\u8bed\u8a00\u53ef\u4ee5\u6267\u884c\u591a\u79cd\u64cd\u4f5c\uff0c\u5305\u62ec\u6570\u636e\u67e5\u8be2\u3001\u6570\u636e\u66f4\u65b0\u3001\u8868\u8bbe\u8ba1\u548c\u7ba1\u7406\u3001\u5b58\u50a8\u8fc7\u7a0b\u548c\u51fd\u6570\u3001\u4e8b\u52a1\u5904\u7406\u7b49\u3002<\/p>\n\n\n\n<p>SQL\u7684\u8bed\u6cd5\u7ed3\u6784\u5305\u62ec\u57fa\u672c\u67e5\u8be2\u8bed\u53e5\u3001WHERE\u5b50\u53e5\u3001ORDER BY\u5b50\u53e5\u3001LIMIT\u5b50\u53e5\u3001GROUP 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