{"id":154669,"date":"2024-11-02T17:44:20","date_gmt":"2024-11-02T09:44:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/154669\/"},"modified":"2024-11-02T17:44:21","modified_gmt":"2024-11-02T09:44:21","slug":"%e5%a4%9a%e8%a1%a8%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2%ef%bc%9a%e8%bc%95%e9%ac%86%e7%8d%b2%e5%8f%96%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%a4%9a%e5%80%8b%e8%a1%a8%e7%9a%84%e6%95%b8%e6%93%9a%e4%be%86","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/154669\/","title":{"rendered":"\u591a\u8868\u806f\u5408\u67e5\u8a62\uff1a\u8f15\u9b06\u7372\u53d6\u6578\u64da\u5eab\u4e2d\u591a\u500b\u8868\u7684\u6578\u64da\u4f86\u6e90\uff08\u6578\u64da\u5eab\u5efa\u7acb\u67e5\u8a62\u6578\u64da\u4f86\u6e90\u591a\u500b\u8868\uff09"},"content":{"rendered":"<h1 id=\"%e5%a4%9a%e8%a1%a8%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2%ef%bc%9a%e8%bc%95%e9%ac%86%e7%8d%b2%e5%8f%96%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%a4%9a%e5%80%8b%e8%a1%a8%e7%9a%84%e6%95%b8%e6%93%9a%e4%be%86-cYUHaioSvc\">\u591a\u8868\u806f\u5408\u67e5\u8a62\uff1a\u8f15\u9b06\u7372\u53d6\u6578\u64da\u5eab\u4e2d\u591a\u500b\u8868\u7684\u6578\u64da\u4f86\u6e90<\/h1>\n<p>\u5728\u73fe\u4ee3\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u7684\u6574\u5408\u8207\u5206\u6790\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002\u5c24\u5176\u662f\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\uff0c\u55ae\u4e00\u8868\u683c\u7684\u6578\u64da\u5f80\u5f80\u7121\u6cd5\u6eff\u8db3\u9700\u6c42\u3002\u9019\u6642\uff0c\u591a\u8868\u806f\u5408\u67e5\u8a62\uff08JOIN\uff09\u4fbf\u6210\u70ba\u4e86\u4e00\u500b\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u591a\u8868\u806f\u5408\u67e5\u8a62\u7684\u6982\u5ff5\u3001\u985e\u578b\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%a4%9a%e8%a1%a8%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2%ef%bc%9f-cYUHaioSvc\">\u4ec0\u9ebc\u662f\u591a\u8868\u806f\u5408\u67e5\u8a62\uff1f<\/h2>\n<p>\u591a\u8868\u806f\u5408\u67e5\u8a62\u662f\u6307\u5728SQL\u67e5\u8a62\u4e2d\uff0c\u901a\u904e\u7279\u5b9a\u7684\u689d\u4ef6\u5c07\u591a\u500b\u8868\u683c\u4e2d\u7684\u6578\u64da\u9032\u884c\u7d50\u5408\uff0c\u5f9e\u800c\u7372\u53d6\u66f4\u70ba\u5168\u9762\u7684\u4fe1\u606f\u3002\u9019\u7a2e\u67e5\u8a62\u65b9\u5f0f\u80fd\u5920\u6709\u6548\u5730\u6574\u5408\u4f86\u81ea\u4e0d\u540c\u8868\u683c\u7684\u6578\u64da\uff0c\u4e26\u4e14\u80fd\u5920\u6839\u64da\u9700\u8981\u9032\u884c\u7be9\u9078\u548c\u6392\u5e8f\u3002<\/p>\n<h2 id=\"%e5%a4%9a%e8%a1%a8%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2%e7%9a%84%e9%a1%9e%e5%9e%8b-cYUHaioSvc\">\u591a\u8868\u806f\u5408\u67e5\u8a62\u7684\u985e\u578b<\/h2>\n<p>\u5728SQL\u4e2d\uff0c\u4e3b\u8981\u6709\u56db\u7a2e\u5e38\u898b\u7684\u806f\u5408\u67e5\u8a62\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>INNER JOIN<\/strong>\uff1a\u50c5\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>LEFT JOIN<\/strong>\uff1a\u8fd4\u56de\u5de6\u5074\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u53f3\u5074\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>RIGHT JOIN<\/strong>\uff1a\u8fd4\u56de\u53f3\u5074\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5de6\u5074\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>FULL OUTER JOIN<\/strong>\uff1a\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u7121\u8ad6\u662f\u5426\u6709\u5339\u914d\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a4%9a%e8%a1%a8%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8-cYUHaioSvc\">\u591a\u8868\u806f\u5408\u67e5\u8a62\u7684\u5be6\u969b\u61c9\u7528<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u591a\u8868\u806f\u5408\u67e5\u8a62\u53ef\u4ee5\u7528\u65bc\u5404\u7a2e\u5834\u666f\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u5728\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\u4e2d\uff0c\u901a\u904e\u806f\u5408\u67e5\u8a62\u7372\u53d6\u7528\u6236\u4fe1\u606f\u548c\u8a02\u55ae\u4fe1\u606f\uff0c\u4ee5\u4fbf\u751f\u6210\u5831\u544a\u3002<\/li>\n<li>\u5728\u793e\u4ea4\u5a92\u9ad4\u61c9\u7528\u4e2d\uff0c\u901a\u904e\u806f\u5408\u67e5\u8a62\u7372\u53d6\u7528\u6236\u8cc7\u6599\u548c\u5176\u767c\u4f48\u7684\u5e16\u5b50\uff0c\u4ee5\u4fbf\u9032\u884c\u6578\u64da\u5206\u6790\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e4%bd%bf%e7%94%a8inner-join%e6%9f%a5%e8%a9%a2-cYUHaioSvc\">\u793a\u4f8b\uff1a\u4f7f\u7528INNER JOIN\u67e5\u8a62<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528INNER JOIN\u7684\u7c21\u55ae\u793a\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\uff1a<code>users<\/code>\u548c<code>orders<\/code>\u3002<\/p>\n<pre><code>SELECT users.name, orders.amount\nFROM users\nINNER JOIN orders ON users.id = orders.user_id;<\/code><\/pre>\n<p>\u9019\u6bb5\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u7528\u6236\u7684\u59d3\u540d\u53ca\u5176\u8a02\u55ae\u91d1\u984d\uff0c\u50c5\u9650\u65bc\u90a3\u4e9b\u6709\u8a02\u55ae\u7684\u7528\u6236\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e4%bd%bf%e7%94%a8left-join%e6%9f%a5%e8%a9%a2-cYUHaioSvc\">\u793a\u4f8b\uff1a\u4f7f\u7528LEFT JOIN\u67e5\u8a62<\/h3>\n<p>\u5982\u679c\u6211\u5011\u5e0c\u671b\u7372\u53d6\u6240\u6709\u7528\u6236\u7684\u59d3\u540d\uff0c\u5373\u4f7f\u4ed6\u5011\u6c92\u6709\u8a02\u55ae\uff0c\u53ef\u4ee5\u4f7f\u7528LEFT JOIN\uff1a<\/p>\n<pre><code>SELECT users.name, orders.amount\nFROM users\nLEFT JOIN orders ON users.id = orders.user_id;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u7528\u6236\u7684\u59d3\u540d\uff0c\u4e26\u4e14\u5c0d\u65bc\u6c92\u6709\u8a02\u55ae\u7684\u7528\u6236\uff0c\u8a02\u55ae\u91d1\u984d\u5c07\u986f\u793a\u70baNULL\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-cYUHaioSvc\">\u7d50\u8ad6<\/h2>\n<p>\u591a\u8868\u806f\u5408\u67e5\u8a62\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u591a\u500b\u8868\u4e2d\u63d0\u53d6\u548c\u6574\u5408\u6578\u64da\u3002\u7121\u8ad6\u662f\u5728\u5546\u696d\u5206\u6790\u3001\u6578\u64da\u6316\u6398\u9084\u662f\u65e5\u5e38\u6578\u64da\u7ba1\u7406\u4e2d\uff0c\u638c\u63e1\u9019\u4e00\u6280\u8853\u90fd\u80fd\u986f\u8457\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u548c\u6578\u64da\u7684\u53ef\u7528\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u7ba1\u7406\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7684\u642d\u5efa\u9084\u662f\u67e5\u8a62\u7684\u512a\u5316\uff0c\u9078\u64c7\u5408\u9069\u7684\u670d\u52d9\u5668\u90fd\u80fd\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u5f37\u6709\u529b\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8f15\u9b06\u638c\u63e1\u591a\u8868\u806f\u5408\u67e5\u8a62\uff0c\u5feb\u901f\u7372\u53d6\u6578\u64da\u5eab\u4e2d\u591a\u500b\u8868\u7684\u6578\u64da\u4f86\u6e90\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u6548\u7387\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-154669","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/154669","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=154669"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/154669\/revisions"}],"predecessor-version":[{"id":154670,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/154669\/revisions\/154670"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=154669"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=154669"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=154669"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}