{"id":167945,"date":"2024-11-06T08:13:17","date_gmt":"2024-11-06T00:13:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/167945\/"},"modified":"2024-11-06T08:13:18","modified_gmt":"2024-11-06T00:13:18","slug":"%e5%85%a9%e5%80%8b%e8%a1%a8%e7%9b%b8%e5%90%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e6%80%8e%e9%ba%bc%e6%89%be%ef%bc%9f-%e5%a6%82%e4%bd%95%e6%89%be%e5%87%ba%e5%85%a9%e5%80%8b%e8%a1%a8%e4%b8%ad%e7%9a%84%e7%9b%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/167945\/","title":{"rendered":"\u5169\u500b\u8868\u76f8\u540c\u6578\u64da\u5eab\u600e\u9ebc\u627e\uff1f (\u5982\u4f55\u627e\u51fa\u5169\u500b\u8868\u4e2d\u7684\u76f8\u540c\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e5%85%a9%e5%80%8b%e8%a1%a8%e7%9b%b8%e5%90%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e6%80%8e%e9%ba%bc%e6%89%be%ef%bc%9f-cXSMndlygg\">\u5169\u500b\u8868\u76f8\u540c\u6578\u64da\u5eab\u600e\u9ebc\u627e\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u6bd4\u8f03\u5169\u500b\u8868\u7684\u6578\u64da\uff0c\u4ee5\u627e\u51fa\u5b83\u5011\u4e4b\u9593\u7684\u76f8\u540c\u6578\u64da\u3002\u9019\u5728\u6578\u64da\u9077\u79fb\u3001\u6578\u64da\u6574\u5408\u6216\u6578\u64da\u6e05\u7406\u7684\u904e\u7a0b\u4e2d\u5c24\u70ba\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u6709\u6548\u5730\u627e\u51fa\u5169\u500b\u8868\u4e2d\u7684\u76f8\u540c\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684 SQL \u67e5\u8a62\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e7%90%86%e8%a7%a3%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e7%9a%84%e7%b5%90%e6%a7%8b-cXSMndlygg\">\u7406\u89e3\u6578\u64da\u5eab\u8868\u7684\u7d50\u69cb<\/h2>\n<p>\u5728\u958b\u59cb\u6bd4\u8f03\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u4e86\u89e3\u5169\u500b\u8868\u7684\u7d50\u69cb\u3002\u6bcf\u500b\u8868\u901a\u5e38\u7531\u591a\u500b\u5217\u7d44\u6210\uff0c\u6bcf\u5217\u4ee3\u8868\u4e00\u500b\u6578\u64da\u5c6c\u6027\u3002\u70ba\u4e86\u627e\u51fa\u76f8\u540c\u6578\u64da\uff0c\u5fc5\u9808\u78ba\u5b9a\u54ea\u4e9b\u5217\u662f\u7528\u4f86\u6bd4\u8f03\u7684\u3002\u901a\u5e38\uff0c\u9019\u4e9b\u5217\u662f\u4e3b\u9375\u6216\u552f\u4e00\u7d22\u5f15\u5217\uff0c\u56e0\u70ba\u5b83\u5011\u80fd\u552f\u4e00\u6a19\u8b58\u6bcf\u4e00\u884c\u6578\u64da\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-sql-%e6%9f%a5%e8%a9%a2%e6%89%be%e5%87%ba%e7%9b%b8%e5%90%8c%e6%95%b8%e6%93%9a-cXSMndlygg\">\u4f7f\u7528 SQL \u67e5\u8a62\u627e\u51fa\u76f8\u540c\u6578\u64da<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u7a2e\u65b9\u6cd5\u4f86\u627e\u51fa\u5169\u500b\u8868\u4e2d\u7684\u76f8\u540c\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8-inner-join-cXSMndlygg\">1. \u4f7f\u7528 INNER JOIN<\/h3>\n<p>INNER JOIN \u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u4e4b\u4e00\uff0c\u5b83\u53ef\u4ee5\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT a.*\nFROM table1 a\nINNER JOIN table2 b ON a.id = b.id;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c`table1` \u548c `table2` \u662f\u8981\u6bd4\u8f03\u7684\u5169\u500b\u8868\uff0c`id` \u662f\u7528\u4f86\u5339\u914d\u7684\u5217\u3002\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728 `table1` \u548c `table2` \u4e2d\u90fd\u6709\u7684\u884c\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8-exists-%e5%ad%90%e6%9f%a5%e8%a9%a2-cXSMndlygg\">2. \u4f7f\u7528 EXISTS \u5b50\u67e5\u8a62<\/h3>\n<p>\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528 EXISTS \u5b50\u67e5\u8a62\u3002\u9019\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u6aa2\u67e5\u67d0\u500b\u689d\u4ef6\u662f\u5426\u5728\u53e6\u4e00\u500b\u8868\u4e2d\u5b58\u5728\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT *\nFROM table1 a\nWHERE EXISTS (SELECT 1 FROM table2 b WHERE a.id = b.id);<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728 `table1` \u4e2d\u7684\u884c\uff0c\u524d\u63d0\u662f\u5b83\u5011\u7684 `id` \u5728 `table2` \u4e2d\u4e5f\u5b58\u5728\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8-intersect-cXSMndlygg\">3. \u4f7f\u7528 INTERSECT<\/h3>\n<p>\u5982\u679c\u6578\u64da\u5eab\u652f\u6301 INTERSECT \u64cd\u4f5c\uff0c\u9019\u662f\u4e00\u500b\u975e\u5e38\u7c21\u55ae\u7684\u65b9\u6cd5\u4f86\u627e\u51fa\u5169\u500b\u8868\u7684\u4ea4\u96c6\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT id FROM table1\nINTERSECT\nSELECT id FROM table2;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u5728 `table1` \u548c `table2` \u4e2d\u90fd\u5b58\u5728\u7684 `id`\u3002<\/p>\n<h2 id=\"%e8%80%83%e6%85%ae%e6%80%a7%e8%83%bd%e5%95%8f%e9%a1%8c-cXSMndlygg\">\u8003\u616e\u6027\u80fd\u554f\u984c<\/h2>\n<p>\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\uff0c\u6027\u80fd\u53ef\u80fd\u6210\u70ba\u4e00\u500b\u554f\u984c\u3002\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u78ba\u4fdd\u5728\u7528\u65bc\u6bd4\u8f03\u7684\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u9019\u6a23\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002\u6b64\u5916\uff0c\u5c0d\u65bc\u975e\u5e38\u5927\u7684\u8868\uff0c\u8003\u616e\u4f7f\u7528\u5206\u9801\u67e5\u8a62\u6216\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\uff0c\u4ee5\u6e1b\u5c11\u7cfb\u7d71\u8ca0\u64d4\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-cXSMndlygg\">\u7e3d\u7d50<\/h2>\n<p>\u627e\u51fa\u5169\u500b\u8868\u4e2d\u7684\u76f8\u540c\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u6578\u64da\u5eab\u64cd\u4f5c\uff0c\u53ef\u4ee5\u901a\u904e\u591a\u7a2e SQL \u67e5\u8a62\u65b9\u6cd5\u4f86\u5be6\u73fe\u3002\u7121\u8ad6\u662f\u4f7f\u7528 INNER JOIN\u3001EXISTS \u5b50\u67e5\u8a62\u9084\u662f INTERSECT\uff0c\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u53d6\u6c7a\u65bc\u5177\u9ad4\u7684\u9700\u6c42\u548c\u6578\u64da\u5eab\u7684\u7d50\u69cb\u3002\u5728\u9032\u884c\u9019\u4e9b\u64cd\u4f5c\u6642\uff0c\u8003\u616e\u6027\u80fd\u554f\u984c\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u6578\u64da\u7ba1\u7406\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u6bd4\u8f03\u5169\u500b\u8868\u4ee5\u627e\u51fa\u76f8\u540c\u6578\u64da\u5eab\uff0c\u638c\u63e1\u6709\u6548\u7684\u67e5\u8a62\u6280\u5de7\u548c\u65b9\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u7ba1\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-167945","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/167945","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=167945"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/167945\/revisions"}],"predecessor-version":[{"id":167946,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/167945\/revisions\/167946"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=167945"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=167945"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=167945"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}