{"id":186778,"date":"2024-11-11T08:45:29","date_gmt":"2024-11-11T00:45:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186778\/"},"modified":"2024-11-11T08:45:31","modified_gmt":"2024-11-11T00:45:31","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b5%90%e6%9e%9c%e6%8b%bc%e6%8e%a5%e6%8a%80%e5%b7%a7%e8%a9%b3%e8%a7%a3-%e6%95%b8%e6%93%9a%e5%ba%abselect%e7%b5%90%e6%9e%9c%e6%8b%bc%e6%8e%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186778\/","title":{"rendered":"\u6578\u64da\u5eab\u7d50\u679c\u62fc\u63a5\u6280\u5de7\u8a73\u89e3 (\u6578\u64da\u5eabselect\u7d50\u679c\u62fc\u63a5)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b5%90%e6%9e%9c%e6%8b%bc%e6%8e%a5%e6%8a%80%e5%b7%a7%e8%a9%b3%e8%a7%a3-%e6%95%b8%e6%93%9a%e5%ba%abselect%e7%b5%90%e6%9e%9c%e6%8b%bc%e6%8e%a5-hGobAZqXbZ\">\u6578\u64da\u5eab\u7d50\u679c\u62fc\u63a5\u6280\u5de7\u8a73\u89e3 (\u6578\u64da\u5eabselect\u7d50\u679c\u62fc\u63a5)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u7684\u62fc\u63a5\u662f\u4e00\u500b\u5e38\u898b\u4e14\u91cd\u8981\u7684\u64cd\u4f5c\u3002\u7121\u8ad6\u662f\u5728\u5831\u544a\u751f\u6210\u3001\u6578\u64da\u5206\u6790\u9084\u662f\u61c9\u7528\u7a0b\u5e8f\u958b\u767c\u4e2d\uff0c\u5c07\u591a\u500b\u6578\u64da\u8868\u7684\u7d50\u679c\u9032\u884c\u62fc\u63a5\uff0c\u80fd\u5920\u63d0\u4f9b\u66f4\u5168\u9762\u7684\u6578\u64da\u8996\u5716\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eab\u4e2d\u7d50\u679c\u62fc\u63a5\u7684\u6280\u5de7\uff0c\u7279\u5225\u662f\u4f7f\u7528 SQL \u8a9e\u53e5\u9032\u884c\u6578\u64da\u62fc\u63a5\u7684\u65b9\u5f0f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b5%90%e6%9e%9c%e6%8b%bc%e6%8e%a5%ef%bc%9f-hGobAZqXbZ\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u7d50\u679c\u62fc\u63a5\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u7d50\u679c\u62fc\u63a5\u662f\u6307\u5c07\u4f86\u81ea\u4e0d\u540c\u6578\u64da\u8868\u7684\u67e5\u8a62\u7d50\u679c\u5408\u4f75\u5728\u4e00\u8d77\uff0c\u4ee5\u4fbf\u65bc\u9032\u884c\u66f4\u6df1\u5165\u7684\u5206\u6790\u6216\u5831\u544a\u3002\u9019\u7a2e\u64cd\u4f5c\u901a\u5e38\u4f7f\u7528 SQL \u8a9e\u8a00\u4e2d\u7684 JOIN \u8a9e\u53e5\u4f86\u5be6\u73fe\u3002\u6839\u64da\u9700\u6c42\u7684\u4e0d\u540c\uff0c\u62fc\u63a5\u53ef\u4ee5\u5206\u70ba\u5167\u90e8\u62fc\u63a5\uff08INNER JOIN\uff09\u3001\u5916\u90e8\u62fc\u63a5\uff08LEFT JOIN\u3001RIGHT JOIN\uff09\u548c\u5168\u5916\u90e8\u62fc\u63a5\uff08FULL OUTER JOIN\uff09\u7b49\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e8%a6%8b%e7%9a%84%e6%8b%bc%e6%8e%a5%e9%a1%9e%e5%9e%8b-hGobAZqXbZ\">\u5e38\u898b\u7684\u62fc\u63a5\u985e\u578b<\/h2>\n<ul>\n<li><strong>\u5167\u90e8\u62fc\u63a5 (INNER JOIN)<\/strong>: \u53ea\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u5de6\u5916\u90e8\u62fc\u63a5 (LEFT JOIN)<\/strong>: \u8fd4\u56de\u5de6\u8868\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u53f3\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u53f3\u5916\u90e8\u62fc\u63a5 (RIGHT JOIN)<\/strong>: \u8fd4\u56de\u53f3\u8868\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5de6\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>\u5168\u5916\u90e8\u62fc\u63a5 (FULL OUTER JOIN)<\/strong>: \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=\"%e4%bd%bf%e7%94%a8-sql-%e9%80%b2%e8%a1%8c%e7%b5%90%e6%9e%9c%e6%8b%bc%e6%8e%a5%e7%9a%84%e7%a4%ba%e4%be%8b-hGobAZqXbZ\">\u4f7f\u7528 SQL \u9032\u884c\u7d50\u679c\u62fc\u63a5\u7684\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528 SQL \u9032\u884c\u6578\u64da\u62fc\u63a5\u7684\u57fa\u672c\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"%e5%85%a7%e9%83%a8%e6%8b%bc%e6%8e%a5%e7%a4%ba%e4%be%8b-hGobAZqXbZ\">\u5167\u90e8\u62fc\u63a5\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT a.id, a.name, b.order_id\nFROM customers a\nINNER JOIN orders b ON a.id = b.customer_id;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5f9e customers \u8868\u548c orders \u8868\u4e2d\u9078\u64c7\u4e86\u5ba2\u6236\u7684 ID \u548c\u540d\u7a31\uff0c\u4ee5\u53ca\u4ed6\u5011\u7684\u8a02\u55ae ID\u3002\u53ea\u6709\u7576\u5ba2\u6236\u548c\u8a02\u55ae\u4e4b\u9593\u6709\u5339\u914d\u6642\uff0c\u7d50\u679c\u624d\u6703\u8fd4\u56de\u3002<\/p>\n<h3 id=\"%e5%b7%a6%e5%a4%96%e9%83%a8%e6%8b%bc%e6%8e%a5%e7%a4%ba%e4%be%8b-hGobAZqXbZ\">\u5de6\u5916\u90e8\u62fc\u63a5\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT a.id, a.name, b.order_id\nFROM customers a\nLEFT JOIN orders b ON a.id = b.customer_id;\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5ba2\u6236\u7684\u8cc7\u6599\uff0c\u5373\u4f7f\u4ed6\u5011\u6c92\u6709\u4efb\u4f55\u8a02\u55ae\u3002\u5c0d\u65bc\u6c92\u6709\u8a02\u55ae\u7684\u5ba2\u6236\uff0corder_id \u5c07\u986f\u793a\u70ba NULL\u3002<\/p>\n<h3 id=\"%e5%8f%b3%e5%a4%96%e9%83%a8%e6%8b%bc%e6%8e%a5%e7%a4%ba%e4%be%8b-hGobAZqXbZ\">\u53f3\u5916\u90e8\u62fc\u63a5\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT a.id, a.name, b.order_id\nFROM customers a\nRIGHT JOIN orders b ON a.id = b.customer_id;\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u8a02\u55ae\u7684\u8cc7\u6599\uff0c\u5373\u4f7f\u6c92\u6709\u5c0d\u61c9\u7684\u5ba2\u6236\u8cc7\u6599\u3002\u5c0d\u65bc\u6c92\u6709\u5c0d\u61c9\u5ba2\u6236\u7684\u8a02\u55ae\uff0c\u5ba2\u6236\u7684\u8cc7\u6599\u5c07\u986f\u793a\u70ba NULL\u3002<\/p>\n<h3 id=\"%e5%85%a8%e5%a4%96%e9%83%a8%e6%8b%bc%e6%8e%a5%e7%a4%ba%e4%be%8b-hGobAZqXbZ\">\u5168\u5916\u90e8\u62fc\u63a5\u793a\u4f8b<\/h3>\n<pre><code>\nSELECT a.id, a.name, b.order_id\nFROM customers a\nFULL OUTER JOIN orders b ON a.id = b.customer_id;\n<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5ba2\u6236\u548c\u6240\u6709\u8a02\u55ae\u7684\u8cc7\u6599\uff0c\u7121\u8ad6\u5b83\u5011\u662f\u5426\u6709\u5339\u914d\u7684\u95dc\u4fc2\u3002<\/p>\n<h2 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id=\"%e7%b8%bd%e7%b5%90-hGobAZqXbZ\">\u7e3d\u7d50<\/h2>\n<p>\u6578\u64da\u5eab\u7d50\u679c\u62fc\u63a5\u662f\u4e00\u9805\u5f37\u5927\u7684\u6280\u8853\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u591a\u500b\u6578\u64da\u8868\u4e2d\u63d0\u53d6\u6709\u50f9\u503c\u7684\u4fe1\u606f\u3002\u901a\u904e\u4f7f\u7528\u4e0d\u540c\u985e\u578b\u7684 JOIN \u8a9e\u53e5\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u9748\u6d3b\u5730\u7d44\u5408\u6578\u64da\uff0c\u6eff\u8db3\u5404\u7a2e\u9700\u6c42\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002\u7121\u8ad6\u662f\u9078\u64c7 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0c\u90fd\u80fd\u70ba\u6578\u64da\u5eab\u64cd\u4f5c\u63d0\u4f9b\u5f37\u6709\u529b\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eab\u7d50\u679c\u62fc\u63a5\u6280\u5de7\uff0c\u5b78\u7fd2\u5982\u4f55\u6709\u6548\u4f7f\u7528SELECT\u8a9e\u53e5\u5408\u4f75\u67e5\u8a62\u7d50\u679c\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\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-186778","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186778","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=186778"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186778\/revisions"}],"predecessor-version":[{"id":186779,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186778\/revisions\/186779"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=186778"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=186778"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=186778"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}