{"id":186556,"date":"2024-11-11T06:54:18","date_gmt":"2024-11-10T22:54:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186556\/"},"modified":"2024-11-11T06:54:19","modified_gmt":"2024-11-10T22:54:19","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e9%ab%98%e7%b4%9a%e6%8a%80%e5%b7%a7%ef%bc%9a%e5%a4%9a%e8%a1%a8%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%e5%a4%9a%e8%a1%a8%e8%81%af%e5%90%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186556\/","title":{"rendered":"\u6578\u64da\u5eab\u9ad8\u7d1a\u6280\u5de7\uff1a\u591a\u8868\u806f\u5408\u67e5\u8a62\uff08\u6578\u64da\u5eab\u591a\u8868\u806f\u5408\u67e5\u8a62\uff09"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e9%ab%98%e7%b4%9a%e6%8a%80%e5%b7%a7%ef%bc%9a%e5%a4%9a%e8%a1%a8%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%e5%a4%9a%e8%a1%a8%e8%81%af%e5%90%88-DhMRJZJbwl\">\u6578\u64da\u5eab\u9ad8\u7d1a\u6280\u5de7\uff1a\u591a\u8868\u806f\u5408\u67e5\u8a62\uff08\u6578\u64da\u5eab\u591a\u8868\u806f\u5408\u67e5\u8a62\uff09<\/h1>\n<p>\u5728\u73fe\u4ee3\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u7684\u7d44\u7e54\u548c\u6aa2\u7d22\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u52a0\uff0c\u55ae\u4e00\u8868\u683c\u7684\u67e5\u8a62\u5df2\u7d93\u7121\u6cd5\u6eff\u8db3\u8907\u96dc\u7684\u696d\u52d9\u9700\u6c42\u3002\u9019\u6642\uff0c\u591a\u8868\u806f\u5408\u67e5\u8a62\uff08JOIN\uff09\u6280\u8853\u4fbf\u6210\u70ba\u4e86\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u7684\u4e00\u500b\u91cd\u8981\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\u6280\u5de7\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-DhMRJZJbwl\">\u4ec0\u9ebc\u662f\u591a\u8868\u806f\u5408\u67e5\u8a62\uff1f<\/h2>\n<p>\u591a\u8868\u806f\u5408\u67e5\u8a62\u662f\u6307\u5728\u4e00\u500bSQL\u67e5\u8a62\u4e2d\uff0c\u5f9e\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u7684\u904e\u7a0b\u3002\u9019\u7a2e\u67e5\u8a62\u901a\u5e38\u7528\u65bc\u9700\u8981\u5f9e\u4e0d\u540c\u8868\u4e2d\u7372\u53d6\u76f8\u95dc\u6578\u64da\u7684\u60c5\u6cc1\u3002\u901a\u904e\u806f\u5408\u67e5\u8a62\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u5728\u4e00\u500b\u7d50\u679c\u96c6\u4e2d\u7372\u5f97\u4f86\u81ea\u591a\u500b\u8868\u7684\u6578\u64da\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u6548\u7387\u548c\u9748\u6d3b\u6027\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-DhMRJZJbwl\">\u591a\u8868\u806f\u5408\u67e5\u8a62\u7684\u985e\u578b<\/h2>\n<p>\u5728SQL\u4e2d\uff0c\u4e3b\u8981\u6709\u56db\u7a2e\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\u8868\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u53f3\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/li>\n<li><strong>RIGHT JOIN<\/strong>\uff1a\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>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%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-DhMRJZJbwl\">\u591a\u8868\u806f\u5408\u67e5\u8a62\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u4ee5\u4e0b\u662f\u591a\u8868\u806f\u5408\u67e5\u8a62\u7684\u57fa\u672c\u8a9e\u6cd5\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nSELECT \u5217\u540d1, \u5217\u540d2\nFROM \u88681\nINNER JOIN \u88682 ON \u88681.\u5171\u540c\u5217 = \u88682.\u5171\u540c\u5217;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>INNER JOIN<\/code>\u7528\u65bc\u5f9e<code>\u88681<\/code>\u548c<code>\u88682<\/code>\u4e2d\u6aa2\u7d22\u5339\u914d\u7684\u6578\u64da\u3002\u5171\u540c\u5217\u662f\u5169\u500b\u8868\u4e2d\u7528\u65bc\u5339\u914d\u7684\u5217\u3002<\/p>\n<h2 id=\"%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e4%b8%ad%e7%9a%84%e6%8a%80%e5%b7%a7-DhMRJZJbwl\">\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u6280\u5de7<\/h2>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e9%81%a9%e7%95%b6%e7%9a%84%e8%81%af%e5%90%88%e9%a1%9e%e5%9e%8b-DhMRJZJbwl\">1. \u4f7f\u7528\u9069\u7576\u7684\u806f\u5408\u985e\u578b<\/h3>\n<p>\u9078\u64c7\u6b63\u78ba\u7684\u806f\u5408\u985e\u578b\u5c0d\u65bc\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u81f3\u95dc\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u9700\u8981\u6240\u6709\u5ba2\u6236\u7684\u8a02\u55ae\u4fe1\u606f\uff0c\u5373\u4f7f\u67d0\u4e9b\u5ba2\u6236\u6c92\u6709\u8a02\u55ae\uff0c\u5247\u61c9\u4f7f\u7528<code>LEFT JOIN<\/code>\u3002<\/p>\n<h3 id=\"2-%e9%81%a9%e7%95%b6%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-DhMRJZJbwl\">2. \u9069\u7576\u4f7f\u7528\u7d22\u5f15<\/h3>\n<p>\u5728\u9032\u884c\u591a\u8868\u806f\u5408\u67e5\u8a62\u6642\uff0c\u78ba\u4fdd\u5728\u806f\u5408\u7684\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u7d22\u5f15\u53ef\u4ee5\u52a0\u5feb\u6578\u64da\u6aa2\u7d22\u901f\u5ea6\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002<\/p>\n<h3 id=\"3-%e9%81%bf%e5%85%8d%e9%81%8e%e5%a4%9a%e7%9a%84%e8%81%af%e5%90%88-DhMRJZJbwl\">3. \u907f\u514d\u904e\u591a\u7684\u806f\u5408<\/h3>\n<p>\u96d6\u7136\u591a\u8868\u806f\u5408\u67e5\u8a62\u975e\u5e38\u5f37\u5927\uff0c\u4f46\u904e\u591a\u7684\u806f\u5408\u6703\u5c0e\u81f4\u67e5\u8a62\u6027\u80fd\u4e0b\u964d\u3002\u61c9\u8a72\u6839\u64da\u5be6\u969b\u9700\u6c42\u5408\u7406\u8a2d\u8a08\u6578\u64da\u5eab\u7d50\u69cb\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u806f\u5408\u3002<\/p>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8%e5%ad%90%e6%9f%a5%e8%a9%a2-DhMRJZJbwl\">4. \u4f7f\u7528\u5b50\u67e5\u8a62<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u5b50\u67e5\u8a62\u53ef\u4ee5\u7c21\u5316\u67e5\u8a62\u908f\u8f2f\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u5148\u5f9e\u4e00\u500b\u8868\u4e2d\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\uff0c\u7136\u5f8c\u518d\u5c07\u5176\u7528\u4f5c\u53e6\u4e00\u500b\u67e5\u8a62\u7684\u689d\u4ef6\u3002<\/p>\n<pre><code>\nSELECT \u5217\u540d1\nFROM \u88681\nWHERE \u5217\u540d2 IN (SELECT \u5217\u540d2 FROM \u88682);\n<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-DhMRJZJbwl\">\u7d50\u8ad6<\/h2>\n<p>\u591a\u8868\u806f\u5408\u67e5\u8a62\u662f\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\uff0c\u638c\u63e1\u5176\u57fa\u672c\u6982\u5ff5\u548c\u6280\u5de7\u5c0d\u65bc\u6578\u64da\u5206\u6790\u548c\u696d\u52d9\u6c7a\u7b56\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u4e0d\u540c\u985e\u578b\u7684\u806f\u5408\u67e5\u8a62\uff0c\u4e26\u7d50\u5408\u7d22\u5f15\u548c\u5b50\u67e5\u8a62\u7b49\u6280\u8853\uff0c\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6709\u66f4\u6df1\u5165\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u7684\u6027\u80fd\u548c\u9748\u6d3b\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1\u6578\u64da\u5eab\u9ad8\u7d1a\u6280\u5de7\uff0c\u5b78\u7fd2\u591a\u8868\u806f\u5408\u67e5\u8a62\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u80fd\u529b\uff0c\u512a\u5316\u67e5\u8a62\u6548\u7387\uff0c\u5be6\u73fe\u6578\u64da\u6574\u5408\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-186556","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186556","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=186556"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186556\/revisions"}],"predecessor-version":[{"id":186557,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186556\/revisions\/186557"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=186556"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=186556"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=186556"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}