{"id":200164,"date":"2025-05-06T10:22:47","date_gmt":"2025-05-06T02:22:47","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200164\/"},"modified":"2025-05-06T10:22:47","modified_gmt":"2025-05-06T02:22:47","slug":"%e5%a6%82%e4%bd%95%e6%9f%a5%e8%af%a2%e7%89%b9%e5%ae%9a%e6%97%a5%e6%9c%9f%e5%86%85%e5%90%8c%e6%97%b6%e6%8b%a5%e6%9c%89%e5%a4%9a%e7%a7%8d%e5%95%86%e5%93%81%e7%9a%84%e5%95%86%e5%ba%97%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200164\/","title":{"rendered":"\u5982\u4f55\u67e5\u8be2\u7279\u5b9a\u65e5\u671f\u5185\u540c\u65f6\u62e5\u6709\u591a\u79cd\u5546\u54c1\u7684\u5546\u5e97\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5982\u4f55\u67e5\u8be2\u7279\u5b9a\u65e5\u671f\u5185\u540c\u65f6\u62e5\u6709\u591a\u79cd\u5546\u54c1\u7684\u5546\u5e97\uff1f<\/h1>\n<p>\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300a\u5982\u4f55\u67e5\u8be2\u7279\u5b9a\u65e5\u671f\u5185\u540c\u65f6\u62e5\u6709\u591a\u79cd\u5546\u54c1\u7684\u5546\u5e97\uff1f\u300b\uff0c\u8986\u76d6\u4e86\u6570\u636e\u5e93\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729945302671cded692a72.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u5982\u4f55\u67e5\u8be2\u7279\u5b9a\u7684\u65e5\u671f\u5185\u540c\u65f6\u62e5\u6709\u591a\u79cd\u5546\u54c1\u7684\u5546\u5e97\uff1f<\/strong><\/p>\n<p>\u4e3a\u4e86\u67e5\u8be2\u6ee1\u8db3\u7279\u5b9a\u65e5\u671f\u5185\u540c\u65f6\u62e5\u6709\u591a\u79cd\u5546\u54c1\u7684\u5546\u5e97\uff0c\u53ef\u4ee5\u8003\u8651\u4ee5\u4e0b sql \u67e5\u8be2\uff1a<\/p>\n<pre>SELECT DISTINCT \u5546\u5e97,COUNT(DISTINCT \u65e5\u671f) countdate \nFROM (\n  SELECT \u5546\u5e97 FROM \u8868 WHERE \u65e5\u671f='2021-09-01'\n  UNION\n  SELECT \u5546\u5e97 FROM \u8868 WHERE \u65e5\u671f='2021-09-02'\n  UNION\n  SELECT \u5546\u5e97 FROM \u8868 WHERE \u65e5\u671f='2021-09-03'  \n) AS tab \nGROUP BY \u5546\u5e97 \nHAVING countdate=3;<\/pre>\n<p>\u6b64\u67e5\u8be2\u6267\u884c\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n<ol>\n<li>\u521b\u5efa\u4e00\u4e2a\u4e2d\u95f4\u8868 tab\uff0c\u5176\u4e2d\u5305\u542b\u6ee1\u8db3\u7279\u5b9a\u65e5\u671f\u6761\u4ef6 (2021-09-01\u30012021-09-02\u30012021-09-03) \u7684\u6240\u6709\u5546\u5e97\u3002<\/li>\n<li>\u8ba1\u7b97\u6bcf\u4e2a\u5546\u5e97\u5728\u8fd9\u4e9b\u7279\u5b9a\u65e5\u671f\u5185\u51fa\u73b0\u7684\u5929\u6570 (countdate)\u3002<\/li>\n<li>\u5206\u7ec4\u5546\u5e97\u5e76\u8fc7\u6ee4\u51fa countdate \u7b49\u4e8e 3 \u7684\u5546\u5e97\uff0c\u8fd9\u610f\u5473\u7740\u8fd9\u4e9b\u5546\u5e97\u5728\u6240\u6709\u4e09\u4e2a\u65e5\u671f\u90fd\u62e5\u6709\u81f3\u5c11\u4e00\u79cd\u5546\u54c1\u3002<\/li>\n<\/ol>\n<p>\u6700\u7ec8\uff0c\u8be5\u67e5\u8be2\u5c06\u8fd4\u56de\u6ee1\u8db3\u6761\u4ef6\u7684\u5546\u5e97\u53ca\u5176\u51fa\u73b0\u7684\u5929\u6570\u3002<\/p>\n<p>\u672c\u7bc7\u5173\u4e8e\u300a\u5982\u4f55\u67e5\u8be2\u7279\u5b9a\u65e5\u671f\u5185\u540c\u65f6\u62e5\u6709\u591a\u79cd\u5546\u54c1\u7684\u5546\u5e97\uff1f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8e\u6570\u636e\u5e93\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u67e5\u8be2\u7279\u5b9a\u65e5\u671f\u5185\u540c\u65f6\u62e5\u6709\u591a\u79cd\u5546&#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-200164","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200164","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=200164"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200164\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200164"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200164"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200164"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}