{"id":45618,"date":"2024-12-01T11:01:40","date_gmt":"2024-12-01T03:01:40","guid":{"rendered":"https:\/\/fwq.ai\/blog\/45618\/"},"modified":"2024-12-01T11:01:40","modified_gmt":"2024-12-01T03:01:40","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-sql-%e6%9f%a5%e8%af%a2%e6%96%87%e7%ab%a0%e5%88%97%e8%a1%a8%e5%b9%b6%e5%88%a4%e6%96%ad%e5%bd%93%e5%89%8d%e7%94%a8%e6%88%b7%e6%98%af%e5%90%a6%e7%82%b9%e8%b5%9e-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/45618\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 SQL \u67e5\u8be2\u6587\u7ae0\u5217\u8868\u5e76\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u70b9\u8d5e\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5982\u4f55\u4f7f\u7528 SQL \u67e5\u8be2\u6587\u7ae0\u5217\u8868\u5e76\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u70b9\u8d5e\uff1f<\/h1>\n<p>\u4eb2\u7231\u7684\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5982\u679c\u4f60\u70b9\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf4\u660e\u4f60\u5bf9\u300a\u5982\u4f55\u4f7f\u7528 SQL \u67e5\u8be2\u6587\u7ae0\u5217\u8868\u5e76\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u70b9\u8d5e\uff1f\u300b\u5f88\u611f\u5174\u8da3\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u7ed9\u5927\u5bb6\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u6240\u6709\u8ba4\u771f\u8bfb\u5b8c\u7684\u7ae5\u978b\u4eec\uff0c\u90fd\u6709\u5b9e\u8d28\u6027\u7684\u63d0\u9ad8\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241113\/173148143567344f5b983c9.jpg\" class=\"aligncenter\" title=\"\u5982\u4f55\u4f7f\u7528 SQL \u67e5\u8be2\u6587\u7ae0\u5217\u8868\u5e76\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u70b9\u8d5e\uff1f\u63d2\u56fe\" alt=\"\u5982\u4f55\u4f7f\u7528 SQL \u67e5\u8be2\u6587\u7ae0\u5217\u8868\u5e76\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u70b9\u8d5e\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u67e5\u8be2\u6587\u7ae0\u5217\u8868\u5e76\u83b7\u53d6\u662f\u5426\u70b9\u8d5e<\/strong><\/p>\n<p>\u8981\u540c\u65f6\u67e5\u8be2\u6587\u7ae0\u5217\u8868\u548c\u6587\u7ae0\u662f\u5426\u88ab\u70b9\u8d5e\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528\u5916\u8fde\u63a5\uff08left join\uff09\u3002<\/p>\n<p><strong>sql \u67e5\u8be2\u8bed\u53e5<\/strong><\/p>\n<pre>select\n    a.id,\n    a.userid,\n    a.workid,\n    a.name,\n    (\n        select\n            count(*)\n        from \u559c\u6b22\u8868 as l\n        where\n            l.workid = a.workid\n    ) as like\nfrom\n    \u6587\u7ae0\u8868 as a\nleft join\n    \u559c\u6b22\u8868 as l\non\n    a.workid = l.workid<\/pre>\n<p><strong>\u67e5\u8be2\u7ed3\u679c<\/strong><\/p>\n<p>\u8fd4\u56de\u7684\u6587\u7ae0\u5217\u8868\u4e2d\u5c06\u5305\u542b\u4ee5\u4e0b\u5217\uff1a<\/p>\n<ul>\n<li>id<\/li>\n<li>userid<\/li>\n<li>workid<\/li>\n<li>name<\/li>\n<li>like\uff1a\u8be5\u6587\u7ae0\u662f\u5426\u88ab\u70b9\u8d5e\uff080\/1\uff09<\/li>\n<\/ul>\n<p><strong>\u5982\u679c\u9700\u8981\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u559c\u6b22<\/strong><\/p>\n<p>\u5982\u679c\u9700\u8981\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u559c\u6b22\u67d0\u7bc7\u6587\u7ae0\uff0c\u5219\u9700\u8981\u5728\u67e5\u8be2\u4e2d\u6dfb\u52a0\u5f53\u524d\u7528\u6237 id\u3002<\/p>\n<p><strong>\u4fee\u6539\u540e\u7684 sql \u67e5\u8be2\u8bed\u53e5<\/strong><\/p>\n<pre>SELECT\n    a.id,\n    a.userid,\n    a.workid,\n    a.name,\n    (\n        SELECT\n            COUNT(*)\n        FROM \u559c\u6b22\u8868 AS l\n        WHERE\n            l.workid = a.workid AND l.userid = &lt;\u5f53\u524d\u7528\u6237 ID&gt;\n    ) AS like\nFROM\n    \u6587\u7ae0\u8868 AS a\nLEFT JOIN\n    \u559c\u6b22\u8868 AS l\nON\n    a.workid = l.workid<\/pre>\n<p>\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u5982\u4f55\u4f7f\u7528 SQL \u67e5\u8be2\u6587\u7ae0\u5217\u8868\u5e76\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u70b9\u8d5e\uff1f\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u4f7f\u7528 SQL \u67e5\u8be2\u6587\u7ae0\u5217\u8868\u5e76\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u70b9\u8d5e\uff1f \u4eb2\u7231\u7684\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5982\u679c\u4f60\u70b9\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf4\u660e\u4f60\u5bf9\u300a\u5982\u4f55\u4f7f\u7528 SQL \u67e5\u8be2\u6587\u7ae0\u5217\u8868\u5e76\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u70b9\u8d5e\uff1f\u300b\u5f88\u611f\u5174\u8da3\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u7ed9\u5927\u5bb6\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u6240\u6709\u8ba4\u771f\u8bfb\u5b8c\u7684\u7ae5\u978b\u4eec\uff0c\u90fd\u6709\u5b9e\u8d28\u6027\u7684\u63d0\u9ad8\u3002 \u5982\u4f55\u67e5\u8be2\u6587\u7ae0\u5217\u8868\u5e76\u83b7\u53d6\u662f\u5426\u70b9\u8d5e \u8981\u540c\u65f6\u67e5\u8be2\u6587\u7ae0\u5217\u8868\u548c\u6587\u7ae0\u662f\u5426\u88ab\u70b9\u8d5e\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528\u5916\u8fde\u63a5\uff08left join\uff09\u3002 sql \u67e5\u8be2\u8bed\u53e5 select a.id, a.userid, a.workid, a.name, ( select count(*) from \u559c\u6b22\u8868 as l where l.workid = a.workid ) as like from \u6587\u7ae0\u8868 as a left join \u559c\u6b22\u8868 as l on a.workid = l.workid \u67e5\u8be2\u7ed3\u679c \u8fd4\u56de\u7684\u6587\u7ae0\u5217\u8868\u4e2d\u5c06\u5305\u542b\u4ee5\u4e0b\u5217\uff1a id userid workid name like\uff1a\u8be5\u6587\u7ae0\u662f\u5426\u88ab\u70b9\u8d5e\uff080\/1\uff09 \u5982\u679c\u9700\u8981\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u559c\u6b22 \u5982\u679c\u9700\u8981\u5224\u65ad\u5f53\u524d\u7528\u6237\u662f\u5426\u559c\u6b22\u67d0\u7bc7\u6587\u7ae0\uff0c\u5219\u9700\u8981\u5728\u67e5\u8be2\u4e2d\u6dfb\u52a0\u5f53\u524d\u7528\u6237 id\u3002 \u4fee\u6539\u540e\u7684 sql [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-45618","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/45618","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=45618"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/45618\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=45618"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=45618"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=45618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}