{"id":200337,"date":"2025-05-06T10:50:41","date_gmt":"2025-05-06T02:50:41","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200337\/"},"modified":"2025-05-06T10:50:41","modified_gmt":"2025-05-06T02:50:41","slug":"%e5%a6%82%e4%bd%95%e6%9f%a5%e8%af%a2%e5%90%8c%e4%b8%80%e8%af%be%e7%a8%8b%e6%88%90%e7%bb%a9%e7%9b%b8%e5%90%8c%e7%9a%84%e5%ad%a6%e7%94%9f%e4%bf%a1%e6%81%af%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200337\/","title":{"rendered":"\u5982\u4f55\u67e5\u8be2\u540c\u4e00\u8bfe\u7a0b\u6210\u7ee9\u76f8\u540c\u7684\u5b66\u751f\u4fe1\u606f\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5982\u4f55\u67e5\u8be2\u540c\u4e00\u8bfe\u7a0b\u6210\u7ee9\u76f8\u540c\u7684\u5b66\u751f\u4fe1\u606f\uff1f<\/h1>\n<p>\u6765\u5230\u4e3b\u673a\u5b9d\u8d1d\u7684\u5927\u5bb6\uff0c\u76f8\u4fe1\u90fd\u662f\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5e0c\u671b\u5728\u8fd9\u91cc\u5b66\u4e60\u6570\u636e\u5e93\u76f8\u5173\u7f16\u7a0b\u77e5\u8bc6\u3002\u4e0b\u9762\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u5e26\u5927\u5bb6\u804a\u804a\u300a\u5982\u4f55\u67e5\u8be2\u540c\u4e00\u8bfe\u7a0b\u6210\u7ee9\u76f8\u540c\u7684\u5b66\u751f\u4fe1\u606f\uff1f\u300b\uff0c\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5b9e\u6218\u5f00\u53d1\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241102\/1730517142672598963d302.jpg\" class=\"aligncenter\"><\/p>\n<p>\u8fd9\u4e2a\u95ee\u9898\u662f\u67e5\u8be2\u4e0d\u540c\u8bfe\u7a0b\u6210\u7ee9\u76f8\u540c\u7684\u5b66\u751f\u7684\u5b66\u751f\u7f16\u53f7\u3001\u8bfe\u7a0b\u7f16\u53f7\u3001\u5b66\u751f\u6210\u7ee9\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cmysql \u7684 group by \u8bed\u53e5\u5728\u8fdb\u884c\u5206\u7ec4\u805a\u5408\u540e\uff0c\u65e0\u6cd5\u5bf9\u805a\u5408\u540e\u7684\u7ed3\u679c\u96c6\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u91c7\u7528\u4e00\u79cd\u8fc2\u56de\u7684\u65b9\u5f0f\uff0c\u4f7f\u7528 group_concat \u51fd\u6570\u5c06\u76f8\u540c\u6210\u7ee9\u7684\u5b66\u751f\u7f16\u53f7\u6309\u5347\u5e8f\u8fde\u63a5\u8d77\u6765\uff0c\u518d\u7ed3\u5408 having \u5b50\u53e5\u8fc7\u6ee4\u6389\u5206\u7ec4\u540e\u6570\u91cf\u5c0f\u4e8e 2 \u7684\u8bb0\u5f55\u3002\u8fd9\u6837\uff0c\u5c31\u53ef\u4ee5\u5f97\u5230\u540c\u8bfe\u7a0b\u3001\u540c\u6210\u7ee9\u7684\u5b66\u751f\u4fe1\u606f\u4e86\u3002<\/p>\n<p>\u5b8c\u6574\u7684\u67e5\u8be2\u8bed\u53e5\u5982\u4e0b\uff1a<\/p>\n<pre>SELECT GROUP_CONCAT(sid ORDER BY sid) AS sids, cid, score\nFROM sc\nGROUP BY cid, score\nHAVING COUNT(1) &gt; 1;<\/pre>\n<p>\u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300a\u5982\u4f55\u67e5\u8be2\u540c\u4e00\u8bfe\u7a0b\u6210\u7ee9\u76f8\u540c\u7684\u5b66\u751f\u4fe1\u606f\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u67e5\u8be2\u540c\u4e00\u8bfe\u7a0b\u6210\u7ee9\u76f8\u540c\u7684\u5b66\u751f\u4fe1&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200337","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200337","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200337"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200337\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200337"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200337"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}