{"id":224,"date":"2025-03-10T11:03:45","date_gmt":"2025-03-10T03:03:45","guid":{"rendered":"https:\/\/zhoujibin.com\/?p=224"},"modified":"2025-03-10T11:09:01","modified_gmt":"2025-03-10T03:09:01","slug":"%e5%b8%b8%e8%a7%81%e7%9a%84sql%e4%bc%98%e5%8c%96%e6%96%b9%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/zhoujibin.com\/?p=224","title":{"rendered":"\u5e38\u89c1\u7684SQL\u4f18\u5316\u65b9\u5f0f"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u7d22\u5f15\u4f18\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u521b\u5efa\u5408\u9002\u7684\u7d22\u5f15<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e3a\u67e5\u8be2\u6761\u4ef6\u521b\u5efa\u7d22\u5f15\uff1a\u5728\u7ecf\u5e38\u51fa\u73b0\u5728WHERE\u5b50\u53e5\u3001JOIN\u6761\u4ef6\u548cORDER BY\u5b50\u53e5\u4e2d\u7684\u5217\u4e0a\u521b\u5efa\u7d22\u5f15\uff0c\u4ee5\u663e\u8457\u63d0\u9ad8\u67e5\u8be2\u901f\u5ea6\u3002\u4f8b\u5982\uff0c\u4e3a\u7528\u6237\u7684\u7535\u5b50\u90ae\u4ef6\u5730\u5740\u5217\u521b\u5efa\u7d22\u5f15\uff0c\u52a0\u5feb\u57fa\u4e8e\u7535\u5b50\u90ae\u4ef6\u5730\u5740\u7684\u67e5\u8be2\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528\u590d\u5408\u7d22\u5f15\uff1a\u5f53\u67e5\u8be2\u6761\u4ef6\u6d89\u53ca\u591a\u5217\u65f6\uff0c\u521b\u5efa\u590d\u5408\u7d22\u5f15\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002\u590d\u5408\u7d22\u5f15\u7684\u987a\u5e8f\u5e94\u6839\u636e\u67e5\u8be2\u9891\u7387\u548c\u9009\u62e9\u6027\u6765\u786e\u5b9a\u3002<\/li>\n\n\n\n<li>\u5b9a\u671f\u5206\u6790\u548c\u4f18\u5316\u7d22\u5f15\uff1a\u968f\u7740\u6570\u636e\u7684\u589e\u957f\uff0c\u539f\u6709\u7d22\u5f15\u53ef\u80fd\u4e0d\u518d\u6700\u4f18\u3002\u4f7f\u7528\u6570\u636e\u5e93\u5de5\u5177\uff08\u5982MySQL\u7684ANALYZE TABLE\u547d\u4ee4\uff09\u5b9a\u671f\u5206\u6790\u7d22\u5f15\u7684\u4f7f\u7528\u60c5\u51b5\uff0c\u5e76\u5220\u9664\u4e0d\u5fc5\u8981\u7684\u7d22\u5f15\uff0c\u907f\u514d\u7d22\u5f15\u8fc7\u591a\u5bfc\u81f4\u7684\u7ef4\u62a4\u5f00\u9500\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u907f\u514d\u7d22\u5f15\u5931\u6548<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u907f\u514d\u5728\u7d22\u5f15\u5217\u4e0a\u8fdb\u884c\u51fd\u6570\u64cd\u4f5c\u6216\u8ba1\u7b97\uff1a\u5728WHERE\u5b50\u53e5\u4e2d\u5bf9\u7d22\u5f15\u5217\u8fdb\u884c\u51fd\u6570\u64cd\u4f5c\u6216\u8ba1\u7b97\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\uff0c\u4ece\u800c\u8fdb\u884c\u5168\u8868\u626b\u63cf\u3002<\/li>\n\n\n\n<li>\u907f\u514d\u4f7f\u7528\u4e0d\u7b49\u4e8e\uff08!=\uff09\u6216NULL\u5224\u65ad\uff1a\u5728WHERE\u5b50\u53e5\u4e2d\u4f7f\u7528\u4e0d\u7b49\u4e8e\uff08!=\uff09\u6216NULL\u5224\u65ad\u4e5f\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u67e5\u8be2\u8bed\u53e5\u4f18\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u907f\u514d\u4f7f\u7528SELECT *<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ea\u9009\u62e9\u9700\u8981\u7684\u5217\uff1a\u5728\u67e5\u8be2\u8bed\u53e5\u4e2d\uff0c\u53ea\u9009\u62e9\u9700\u8981\u7684\u5217\uff0c\u907f\u514d\u4f7f\u7528SELECT *\uff0c\u4ee5\u51cf\u5c11\u6570\u636e\u4f20\u8f93\u91cf\uff0c\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u5408\u7406\u4f7f\u7528JOIN<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u907f\u514d\u4e0d\u5fc5\u8981\u7684JOIN\uff1a\u5728\u67e5\u8be2\u4e2d\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8868\u8fde\u63a5\uff0c\u7279\u522b\u662f\u591a\u8868\u8fde\u63a5\u3002\u786e\u4fdd\u8fde\u63a5\u6761\u4ef6\u8db3\u591f\u4e25\u683c\uff0c\u4ee5\u51cf\u5c11\u67e5\u8be2\u7684\u6570\u636e\u91cf\u3002<\/li>\n\n\n\n<li>\u5c0f\u8868\u9a71\u52a8\u5927\u8868\uff1a\u5728\u8fdb\u884c\u8868\u8fde\u63a5\u65f6\uff0c\u5c3d\u91cf\u4f7f\u7528\u5c0f\u8868\u7684\u6570\u636e\u96c6\u6765\u9a71\u52a8\u5927\u8868\u7684\u6570\u636e\u96c6\uff0c\u4ee5\u51cf\u5c11\u626b\u63cf\u7684\u6570\u636e\u91cf\uff0c\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u51cf\u5c11\u5b50\u67e5\u8be2<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528JOIN\u66ff\u4ee3\u5b50\u67e5\u8be2\uff1a\u5728\u53ef\u80fd\u7684\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528JOIN\u66ff\u4ee3\u5b50\u67e5\u8be2\uff0c\u56e0\u4e3aJOIN\u64cd\u4f5c\u901a\u5e38\u6bd4\u5b50\u67e5\u8be2\u66f4\u9ad8\u6548\u3002<\/li>\n\n\n\n<li>\u4f18\u5316\u5b50\u67e5\u8be2\uff1a\u5982\u679c\u5fc5\u987b\u4f7f\u7528\u5b50\u67e5\u8be2\uff0c\u5e94\u786e\u4fdd\u5b50\u67e5\u8be2\u5c3d\u53ef\u80fd\u7b80\u5355\uff0c\u907f\u514d\u5d4c\u5957\u8fc7\u591a\u7684\u5b50\u67e5\u8be2\u3002\u540c\u65f6\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528EXISTS\u66ff\u4ee3IN\u5b50\u67e5\u8be2\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u5206\u9875\u67e5\u8be2\u4f18\u5316<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u4e3b\u952e\u8303\u56f4\u67e5\u8be2\uff1a\u5bf9\u4e8e\u5927\u6570\u636e\u91cf\u7684\u8868\uff0c\u4f7f\u7528\u4e3b\u952e\u8303\u56f4\u67e5\u8be2\u7b49\u65b9\u5f0f\u4f18\u5316\u5206\u9875\uff0c\u907f\u514d\u4f7f\u7528\u5927\u7684OFFSET\u503c\uff0c\u56e0\u4e3aOFFSET\u503c\u8d8a\u5927\uff0c\u67e5\u8be2\u6548\u7387\u8d8a\u4f4e\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f7f\u7528UNION ALL\u66ff\u4ee3UNION<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u907f\u514d\u53bb\u91cd\u64cd\u4f5c\uff1a\u5982\u679c\u67e5\u8be2\u7ed3\u679c\u5141\u8bb8\u91cd\u590d\u8bb0\u5f55\uff0c\u53ef\u4ee5\u4f7f\u7528UNION ALL\u66ff\u4ee3UNION\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\uff0c\u56e0\u4e3aUNION\u64cd\u4f5c\u4f1a\u53bb\u9664\u91cd\u590d\u8bb0\u5f55\uff0c\u589e\u52a0\u989d\u5916\u7684\u5f00\u9500\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u67e5\u8be2\u6761\u4ef6\u4f18\u5316<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u907f\u514d<code>IS NULL<\/code>\u67e5\u8be2\uff1a\u5728\u8868\u8bbe\u8ba1\u65f6\u8bbe\u7f6e\u9ed8\u8ba4\u503c\uff0c\u907f\u514d\u67e5\u8be2\u6761\u4ef6\u4e2d\u51fa\u73b0<code>IS NULL<\/code>\uff0c\u56e0\u4e3a<code>IS NULL<\/code>\u67e5\u8be2\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u3002<\/li>\n\n\n\n<li>\u786e\u4fdd\u67e5\u8be2\u6761\u4ef6\u6570\u636e\u7c7b\u578b\u4e00\u81f4\uff1a\u907f\u514d\u67e5\u8be2\u6761\u4ef6\u6570\u636e\u7c7b\u578b\u4e0e\u5217\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4\uff0c\u5bfc\u81f4\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\uff0c\u8fdb\u800c\u5f71\u54cd\u67e5\u8be2\u6027\u80fd\u3002<\/li>\n\n\n\n<li>\u907f\u514d\u5728\u67e5\u8be2\u6761\u4ef6\u4e2d\u4f7f\u7528\u8ba1\u7b97\u51fd\u6570\uff1a\u5728\u67e5\u8be2\u6761\u4ef6\u4e2d\u4f7f\u7528\u8ba1\u7b97\u51fd\u6570\u4f1a\u589e\u52a0\u989d\u5916\u7684\u5f00\u9500\uff0c\u964d\u4f4e\u67e5\u8be2\u901f\u5ea6\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u6570\u636e\u5e93\u8bbe\u8ba1\u4f18\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u89c4\u8303\u5316\u8bbe\u8ba1<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u51cf\u5c11\u6570\u636e\u5197\u4f59\uff1a\u901a\u8fc7\u89c4\u8303\u5316\u8bbe\u8ba1\uff0c\u5c06\u6570\u636e\u5e93\u8868\u5206\u89e3\u4e3a\u66f4\u5c0f\u7684\u3001\u66f4\u89c4\u8303\u7684\u8868\uff0c\u4ee5\u51cf\u5c11\u6570\u636e\u5197\u4f59\uff0c\u63d0\u9ad8\u6570\u636e\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u53cd\u89c4\u8303\u5316\u8bbe\u8ba1<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\uff1a\u5728\u67d0\u4e9b\u573a\u666f\u4e0b\uff0c\u9002\u5f53\u7684\u6570\u636e\u5197\u4f59\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002\u4f8b\u5982\uff0c\u5728\u8bfb\u591a\u5199\u5c11\u7684\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u5728\u67d0\u4e9b\u8868\u4e2d\u589e\u52a0\u5197\u4f59\u5b57\u6bb5\uff0c\u4ee5\u51cf\u5c11JOIN\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u907f\u514d\u7a7a\u95f4\u6d6a\u8d39\uff1a\u4e3a\u5217\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u7a7a\u95f4\u6d6a\u8d39\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u6279\u91cf\u64cd\u4f5c\u4f18\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u6279\u91cf\u63d2\u5165\u548c\u66f4\u65b0<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u51cf\u5c11\u6570\u636e\u5e93\u8bf7\u6c42\u6b21\u6570\uff1a\u5728\u5904\u7406\u5927\u91cf\u6570\u636e\u65f6\uff0c\u4f7f\u7528\u6279\u91cf\u63d2\u5165\u548c\u66f4\u65b0\u64cd\u4f5c\u53ef\u4ee5\u51cf\u5c11\u6570\u636e\u5e93\u8bf7\u6c42\u6b21\u6570\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u786c\u4ef6\u4f18\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u589e\u52a0\u5185\u5b58<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u63d0\u9ad8\u7f13\u5b58\u547d\u4e2d\u7387\uff1a\u66f4\u591a\u7684\u5185\u5b58\u610f\u5473\u7740\u66f4\u5927\u7684\u7f13\u5b58\u533a\uff0c\u53ef\u4ee5\u63d0\u9ad8\u7f13\u5b58\u547d\u4e2d\u7387\uff0c\u51cf\u5c11\u78c1\u76d8I\/O\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f7f\u7528\u9ad8\u901f\u5b58\u50a8\u8bbe\u5907<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u63d0\u9ad8I\/O\u6027\u80fd\uff1a\u4f7f\u7528\u56fa\u6001\u786c\u76d8\uff08SSD\uff09\u66ff\u4ee3\u4f20\u7edf\u673a\u68b0\u786c\u76d8\u53ef\u4ee5\u5927\u5e45\u63d0\u5347I\/O\u6027\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u7f51\u7edc\u4f18\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u63d0\u9ad8\u7f51\u7edc\u5e26\u5bbd<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u51cf\u5c11\u7f51\u7edc\u5ef6\u8fdf\uff1a\u4f18\u5316\u6570\u636e\u5e93\u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u4e4b\u95f4\u7684\u7f51\u7edc\u8fde\u63a5\uff0c\u786e\u4fdd\u7f51\u7edc\u5e26\u5bbd\u5145\u8db3\uff0c\u4ee5\u51cf\u5c11\u7f51\u7edc\u5ef6\u8fdf\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f7f\u7528\u6570\u636e\u538b\u7f29<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u51cf\u5c11\u6570\u636e\u4f20\u8f93\u91cf\uff1a\u5728\u7f51\u7edc\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u4f7f\u7528\u6570\u636e\u538b\u7f29\u6280\u672f\u53ef\u4ee5\u51cf\u5c11\u6570\u636e\u4f20\u8f93\u91cf\uff0c\u63d0\u9ad8\u4f20\u8f93\u901f\u5ea6\u3002<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7d22\u5f15\u4f18\u5316 \u521b\u5efa\u5408\u9002\u7684\u7d22\u5f15 \u907f\u514d\u7d22\u5f15\u5931\u6548 \u67e5\u8be2\u8bed\u53e5\u4f18\u5316 \u907f\u514d\u4f7f\u7528SELECT * \u5408\u7406\u4f7f\u7528JOIN \u51cf\u5c11\u5b50\u67e5\u8be2  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[26],"class_list":["post-224","post","type-post","status-publish","format-standard","hentry","category-database","tag-sql"],"_links":{"self":[{"href":"https:\/\/zhoujibin.com\/index.php?rest_route=\/wp\/v2\/posts\/224"}],"collection":[{"href":"https:\/\/zhoujibin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhoujibin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhoujibin.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhoujibin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=224"}],"version-history":[{"count":3,"href":"https:\/\/zhoujibin.com\/index.php?rest_route=\/wp\/v2\/posts\/224\/revisions"}],"predecessor-version":[{"id":228,"href":"https:\/\/zhoujibin.com\/index.php?rest_route=\/wp\/v2\/posts\/224\/revisions\/228"}],"wp:attachment":[{"href":"https:\/\/zhoujibin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=224"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhoujibin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=224"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhoujibin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=224"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}