{"id":200353,"date":"2025-05-06T09:19:44","date_gmt":"2025-05-06T01:19:44","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200353\/"},"modified":"2025-05-06T09:19:44","modified_gmt":"2025-05-06T01:19:44","slug":"%e5%a6%82%e4%bd%95%e6%9f%a5%e8%af%a2%e5%87%ba%e5%90%8c%e8%af%be%e7%a8%8b%e3%80%81%e5%90%8c%e6%88%90%e7%bb%a9%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\/200353\/","title":{"rendered":"\u5982\u4f55\u67e5\u8be2\u51fa\u540c\u8bfe\u7a0b\u3001\u540c\u6210\u7ee9\u7684\u5b66\u751f\u4fe1\u606f\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5982\u4f55\u67e5\u8be2\u51fa\u540c\u8bfe\u7a0b\u3001\u540c\u6210\u7ee9\u7684\u5b66\u751f\u4fe1\u606f\uff1f<\/h1>\n<p>\u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300a\u5982\u4f55\u67e5\u8be2\u51fa\u540c\u8bfe\u7a0b\u3001\u540c\u6210\u7ee9\u7684\u5b66\u751f\u4fe1\u606f\uff1f\u300b\uff0c\u4e3b\u8981\u5305\u62ec\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241102\/17305434446725ff540ffbf.jpg\" class=\"aligncenter\"><\/p>\n<p>\u5982\u4f55\u67e5\u8be2\u51fa\u540c\u8bfe\u7a0b\u3001\u540c\u6210\u7ee9\u7684\u5b66\u751f\u7684\u5b66\u53f7\u3001\u8bfe\u7a0b\u7f16\u53f7\u548c\u6210\u7ee9\uff1f<\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 mysql \u4e2d\u7684 group by \u548c having \u5b50\u53e5\u3002<\/p>\n<p>.group by \u5b50\u53e5\u7528\u4e8e\u5c06\u8868\u4e2d\u7684\u6570\u636e\u5206\u7ec4\u3002\u5b83\u5c06\u76f8\u540c\u503c\u7684\u884c\u5206\u7ec4\u5230\u4e00\u8d77\uff0c\u5e76\u4e3a\u6bcf\u4e2a\u7ec4\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u884c\u3002\u5728\u672c\u4f8b\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u6309 cid\uff08\u8bfe\u7a0b\u7f16\u53f7\uff09\u548c score\uff08\u6210\u7ee9\uff09\u5bf9 sc` \u8868\u8fdb\u884c\u5206\u7ec4\u3002<\/p>\n<p>.having \u5b50\u53e5\u7528\u4e8e\u5bf9\u5206\u7ec4\u540e\u7684\u6570\u636e\u8fdb\u884c\u7b5b\u9009\u3002\u5b83\u5c06\u57fa\u4e8e\u5206\u7ec4\u7ed3\u679c\u5bf9\u6570\u636e\u8fdb\u884c\u9650\u5236\u3002\u5728\u672c\u4f8b\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 having` \u7b5b\u9009\u51fa\u73b0\u6b21\u6570\u5927\u4e8e 1 \u7684\u7ec4\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u67e5\u8be2\u7684\u5b8c\u6574\u4ee3\u7801\uff1a<\/p>\n<pre>select group_concat(sid order by sid) sids, cid, score \nfrom sc \ngroup by cid, score \nhaving count(1) &gt; 1;<\/pre>\n<p>\u8be5\u67e5\u8be2\u5c06\u8fd4\u56de\u4ee5\u4e0b\u7ed3\u679c\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>sids<\/th>\n<th>cid<\/th>\n<th>score<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>01,03<\/td>\n<td>01<\/td>\n<td>80.0<\/td>\n<\/tr>\n<tr>\n<td>02,03<\/td>\n<td>03<\/td>\n<td>80.0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8fd9\u4e0e\u671f\u671b\u7684\u7ed3\u679c\u662f\u4e00\u81f4\u7684\uff0c\u5c55\u793a\u4e86\u4e0d\u540c\u8bfe\u7a0b\u6210\u7ee9\u76f8\u540c\u7684\u5b66\u751f\u7684\u5b66\u751f\u7f16\u53f7\u3001\u8bfe\u7a0b\u7f16\u53f7\u548c\u5b66\u751f\u6210\u7ee9\u3002<\/p>\n<p>\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300a\u5982\u4f55\u67e5\u8be2\u51fa\u540c\u8bfe\u7a0b\u3001\u540c\u6210\u7ee9\u7684\u5b66\u751f\u4fe1\u606f\uff1f\u300b\u7684\u4ecb\u7ecd\u5e94\u8be5\u8ba9\u4f60\u6536\u83b7\u591a\u591a\u4e86\u5427\uff01\u6b22\u8fce\u5927\u5bb6\u6536\u85cf\u6216\u5206\u4eab\u7ed9\u66f4\u591a\u9700\u8981\u5b66\u4e60\u7684\u670b\u53cb\u5427~\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03\u6570\u636e\u5e93\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u67e5\u8be2\u51fa\u540c\u8bfe\u7a0b\u3001\u540c\u6210\u7ee9\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-200353","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200353","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=200353"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200353\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200353"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200353"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200353"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}