{"id":7151,"date":"2024-11-14T10:51:02","date_gmt":"2024-11-14T02:51:02","guid":{"rendered":"https:\/\/fwq.ai\/blog\/7151\/"},"modified":"2024-11-14T10:51:02","modified_gmt":"2024-11-14T02:51:02","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:\/\/fwq.ai\/blog\/7151\/","title":{"rendered":"\u5982\u4f55\u67e5\u8be2\u51fa\u540c\u8bfe\u7a0b\u3001\u540c\u6210\u7ee9\u7684\u5b66\u751f\u4fe1\u606f\uff1f"},"content":{"rendered":"

\"\u5982\u4f55\u67e5\u8be2\u51fa\u540c\u8bfe\u7a0b\u3001\u540c\u6210\u7ee9\u7684\u5b66\u751f\u4fe1\u606f\uff1f\u63d2\u56fe\"<\/p>\n

\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

\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 \u4e2d\u7684 group by \u548c having \u5b50\u53e5\u3002<\/p>\n

.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

.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

\u4ee5\u4e0b\u662f\u67e5\u8be2\u7684\u5b8c\u6574\u4ee3\u7801\uff1a<\/p>\n

select group_concat(sid order by sid) sids, cid, score \nfrom sc \ngroup by cid, score \nhaving count(1) > 1;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u8be5\u67e5\u8be2\u5c06\u8fd4\u56de\u4ee5\u4e0b\u7ed3\u679c\uff1a<\/p>\n\n\n\n\n\n\n
sids<\/th>\ncid<\/th>\nscore<\/th>\n<\/tr>\n<\/thead>\n
01,03<\/td>\n01<\/td>\n80.0<\/td>\n<\/tr>\n
02,03<\/td>\n03<\/td>\n80.0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\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
\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u67e5\u8be2\u51fa\u540c\u8bfe\u7a0b\u3001\u540c\u6210\u7ee9\u7684\u5b66\u751f\u4fe1\u606f\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\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 \u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 \u4e2d\u7684 group by \u548c having \u5b50\u53e5\u3002 .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 .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 \u4ee5\u4e0b\u662f\u67e5\u8be2\u7684\u5b8c\u6574\u4ee3\u7801\uff1a select group_concat(sid order by sid) sids, cid, score from sc group by cid, score having count(1) > 1; \u767b\u5f55\u540e\u590d\u5236 \u8be5\u67e5\u8be2\u5c06\u8fd4\u56de\u4ee5\u4e0b\u7ed3\u679c\uff1a sids cid score 01,03 01 80.0 02,03 03 80.0 \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 \u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u67e5\u8be2\u51fa\u540c\u8bfe\u7a0b\u3001\u540c\u6210\u7ee9\u7684\u5b66\u751f\u4fe1\u606f\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/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-7151","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/7151","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=7151"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/7151\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=7151"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=7151"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=7151"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}