{"id":173533,"date":"2024-11-07T18:49:22","date_gmt":"2024-11-07T10:49:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/173533\/"},"modified":"2024-11-07T18:49:23","modified_gmt":"2024-11-07T10:49:23","slug":"%e5%a6%82%e4%bd%95%e8%a8%88%e7%ae%97%e6%95%b8%e6%93%9a%e5%ba%ab%e5%bb%a3%e7%be%a9%e7%ac%9b%e5%8d%a1%e7%88%be%e7%a9%8d-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%bb%a3%e7%be%a9%e7%ac%9b%e5%8d%a1%e7%88%be%e7%a9%8d","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/173533\/","title":{"rendered":"\u5982\u4f55\u8a08\u7b97\u6578\u64da\u5eab\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d (\u6578\u64da\u5eab\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\u600e\u9ebc\u7b97)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e8%a8%88%e7%ae%97%e6%95%b8%e6%93%9a%e5%ba%ab%e5%bb%a3%e7%be%a9%e7%ac%9b%e5%8d%a1%e7%88%be%e7%a9%8d-GuAPbqwRiO\">\u5982\u4f55\u8a08\u7b97\u6578\u64da\u5eab\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5c24\u5176\u662f\u5728\u8655\u7406\u591a\u500b\u8868\u4e4b\u9593\u7684\u95dc\u4fc2\u6642\u3002\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\u662f\u6307\u5c07\u5169\u500b\u6216\u591a\u500b\u8868\u4e2d\u7684\u6240\u6709\u884c\u9032\u884c\u7d44\u5408\uff0c\u751f\u6210\u4e00\u500b\u65b0\u7684\u7d50\u679c\u96c6\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u8a08\u7b97\u6578\u64da\u5eab\u7684\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%bb%a3%e7%be%a9%e7%ac%9b%e5%8d%a1%e7%88%be%e7%a9%8d%ef%bc%9f-GuAPbqwRiO\">\u4ec0\u9ebc\u662f\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\uff1f<\/h2>\n<p>\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\u662f\u6578\u64da\u5eab\u4e2d\u4e00\u7a2e\u64cd\u4f5c\uff0c\u901a\u5e38\u7528\u65bc\u5f9e\u591a\u500b\u8868\u4e2d\u7372\u53d6\u6240\u6709\u53ef\u80fd\u7684\u884c\u7d44\u5408\u3002\u5047\u8a2d\u6709\u5169\u500b\u8868 A \u548c B\uff0c\u8868 A \u6709 m \u884c\uff0c\u8868 B \u6709 n \u884c\uff0c\u5247\u5b83\u5011\u7684\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\u5c07\u6703\u6709 m \u00d7 n \u884c\u3002\u9019\u7a2e\u64cd\u4f5c\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u975e\u5e38\u6709\u7528\uff0c\u4f8b\u5982\u5728\u9700\u8981\u751f\u6210\u6240\u6709\u53ef\u80fd\u7684\u7d44\u5408\u6642\u3002<\/p>\n<h2 id=\"%e8%a8%88%e7%ae%97%e5%bb%a3%e7%be%a9%e7%ac%9b%e5%8d%a1%e7%88%be%e7%a9%8d%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%96%b9%e6%b3%95-GuAPbqwRiO\">\u8a08\u7b97\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u8a08\u7b97\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\u7684\u6700\u5e38\u898b\u65b9\u6cd5\u662f\u4f7f\u7528 <code>JOIN<\/code> \u64cd\u4f5c\uff0c\u7279\u5225\u662f <code>CROSS JOIN<\/code>\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 <code>CROSS JOIN<\/code> \u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>SELECT * FROM \u8868A CROSS JOIN \u8868B;<\/code><\/pre>\n<p>\u9019\u689d SQL \u8a9e\u53e5\u5c07\u8fd4\u56de\u8868 A \u548c\u8868 B \u7684\u6240\u6709\u884c\u7684\u7d44\u5408\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u5177\u9ad4\u7684\u4f8b\u5b50\uff1a<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-GuAPbqwRiO\">\u793a\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\uff1a<\/p>\n<ul>\n<li>\u8868 A (\u9867\u5ba2)\uff1a<\/li>\n<ul>\n<li>\u9867\u5ba2ID<\/li>\n<li>\u9867\u5ba2\u59d3\u540d<\/li>\n<\/ul>\n<li>\u8868 B (\u7522\u54c1)\uff1a<\/li>\n<ul>\n<li>\u7522\u54c1ID<\/li>\n<li>\u7522\u54c1\u540d\u7a31<\/li>\n<\/ul>\n<\/ul>\n<p>\u8868 A \u7684\u6578\u64da\uff1a<\/p>\n<pre><code>\u9867\u5ba2ID | \u9867\u5ba2\u59d3\u540d\n1      | \u5f35\u4e09\n2      | \u674e\u56db<\/code><\/pre>\n<p>\u8868 B \u7684\u6578\u64da\uff1a<\/p>\n<pre><code>\u7522\u54c1ID | \u7522\u54c1\u540d\u7a31\n1      | \u96fb\u8166\n2      | \u624b\u6a5f<\/code><\/pre>\n<p>\u57f7\u884c\u4ee5\u4e0b SQL \u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM \u9867\u5ba2 CROSS JOIN \u7522\u54c1;<\/code><\/pre>\n<p>\u7d50\u679c\u5c07\u6703\u662f\uff1a<\/p>\n<pre><code>\u9867\u5ba2ID | \u9867\u5ba2\u59d3\u540d | \u7522\u54c1ID | \u7522\u54c1\u540d\u7a31\n1      | \u5f35\u4e09    | 1      | \u96fb\u8166\n1      | \u5f35\u4e09    | 2      | \u624b\u6a5f\n2      | \u674e\u56db    | 1      | \u96fb\u8166\n2      | \u674e\u56db    | 2      | \u624b\u6a5f<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-GuAPbqwRiO\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\u6642\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u6027\u80fd\u554f\u984c\uff1a<\/strong>\u7576\u8868\u7684\u884c\u6578\u975e\u5e38\u5927\u6642\uff0c\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\u53ef\u80fd\u6703\u751f\u6210\u5927\u91cf\u7684\u6578\u64da\uff0c\u9019\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li><strong>\u6578\u64da\u5197\u9918\uff1a<\/strong>\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\u6703\u751f\u6210\u6240\u6709\u53ef\u80fd\u7684\u7d44\u5408\uff0c\u9019\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u5197\u9918\uff0c\u7279\u5225\u662f\u5728\u4e0d\u9700\u8981\u6240\u6709\u7d44\u5408\u7684\u60c5\u6cc1\u4e0b\u3002<\/li>\n<li><strong>\u4f7f\u7528\u5834\u666f\uff1a<\/strong>\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\u901a\u5e38\u7528\u65bc\u9700\u8981\u751f\u6210\u6240\u6709\u53ef\u80fd\u7d44\u5408\u7684\u60c5\u6cc1\uff0c\u4f8b\u5982\u5831\u544a\u751f\u6210\u6216\u6578\u64da\u5206\u6790\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-GuAPbqwRiO\">\u7d50\u8ad6<\/h2>\n<p>\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u6578\u64da\u5eab\u7528\u6236\u5f9e\u591a\u500b\u8868\u4e2d\u7372\u53d6\u6240\u6709\u53ef\u80fd\u7684\u884c\u7d44\u5408\u3002\u96d6\u7136\u5b83\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u975e\u5e38\u6709\u7528\uff0c\u4f46\u4e5f\u9700\u8981\u8b39\u614e\u4f7f\u7528\uff0c\u4ee5\u907f\u514d\u6027\u80fd\u554f\u984c\u548c\u6578\u64da\u5197\u9918\u3002\u4e86\u89e3\u5982\u4f55\u8a08\u7b97\u548c\u4f7f\u7528\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\uff0c\u5c07\u6709\u52a9\u65bc\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u5206\u6790\u6578\u64da\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u554f\u984c\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a href=\"https:\/\/server.hk\">Server.HK<\/a>\uff0c\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">VPS<\/a> \u548c <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u8a08\u7b97\u6578\u64da\u5eab\u4e2d\u7684\u5ee3\u7fa9\u7b1b\u5361\u723e\u7a4d\uff0c\u638c\u63e1\u5176\u5b9a\u7fa9\u3001\u516c\u5f0f\u53ca\u5be6\u969b\u61c9\u7528\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u80fd\u529b\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-173533","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173533","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=173533"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173533\/revisions"}],"predecessor-version":[{"id":173534,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173533\/revisions\/173534"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=173533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=173533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=173533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}