{"id":200784,"date":"2025-05-06T09:14:06","date_gmt":"2025-05-06T01:14:06","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200784\/"},"modified":"2025-05-06T09:14:06","modified_gmt":"2025-05-06T01:14:06","slug":"sql-%e5%ad%90%e5%8f%a5%e6%89%a7%e8%a1%8c%e9%a1%ba%e5%ba%8f%ef%bc%9a%e5%85%88-having-%e8%bf%98%e6%98%af%e5%85%88-select%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200784\/","title":{"rendered":"SQL \u5b50\u53e5\u6267\u884c\u987a\u5e8f\uff1a\u5148 HAVING \u8fd8\u662f\u5148 SELECT\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>SQL \u5b50\u53e5\u6267\u884c\u987a\u5e8f\uff1a\u5148 HAVING \u8fd8\u662f\u5148 SELECT\uff1f<\/h1>\n<p>\u5077\u5077\u52aa\u529b\uff0c\u6084\u65e0\u58f0\u606f\u5730\u53d8\u5f3a\uff0c\u7136\u540e\u60ca\u8273\u6240\u6709\u4eba\uff01\u54c8\u54c8\uff0c\u5c0f\u4f19\u4f34\u4eec\u53c8\u6765\u5b66\u4e60\u5566~\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u4ecb\u7ecd\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4f1a\u8bb2\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u4e0d\u77e5\u9053\u5927\u5bb6\u5bf9\u5176\u90fd\u6709\u591a\u5c11\u4e86\u89e3\uff0c\u4e0b\u9762\u6211\u4eec\u5c31\u4e00\u8d77\u6765\u770b\u4e00\u5427\uff01\u5f53\u7136\uff0c\u975e\u5e38\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u8bc4\u8bba\uff0c\u7ed9\u51fa\u5408\u7406\u7684\u5efa\u8bae\uff0c\u6211\u4eec\u4e00\u8d77\u5b66\u4e60\uff0c\u4e00\u8d77\u8fdb\u6b65\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241114\/17315780906735c8ea262aa.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u5148 having \u8fd8\u662f\u5148 select\uff1fsql \u5b50\u53e5\u6267\u884c\u987a\u5e8f\u63ed\u79d8<\/strong><\/p>\n<p>sql \u8bed\u53e5\u4e2d\uff0chaving \u5b50\u53e5\u7528\u4e8e\u7b5b\u9009\u7ec4\u5185\u7684\u8bb0\u5f55\uff0c\u800c select \u5b50\u53e5\u7528\u4e8e\u9009\u62e9\u8981\u663e\u793a\u7684\u5217\u3002\u90a3\u4e48\uff0c\u662f\u5148\u6267\u884c having \u5b50\u53e5\u8fd8\u662f select \u5b50\u53e5\u5462\uff1f<\/p>\n<p>\u4f20\u7edf\u89c2\u70b9\u8ba4\u4e3a\uff0c\u5148\u6267\u884c having \u5b50\u53e5\uff0c\u7136\u540e\u518d\u6267\u884c select \u5b50\u53e5\u3002\u7136\u800c\uff0c\u793a\u4f8b\u4ee3\u7801\u4e2d\u4f3c\u4e4e\u4e0e\u8fd9\u4e00\u89c2\u70b9\u76f8\u6096\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre>SELECT sum(num) AS all_num\nFROM table\nGROUP BY id\nHAVING all_num &gt; 50<\/pre>\n<p>\u6267\u884c\u7ed3\u679c\u663e\u793a\uff0c\u5148\u6267\u884c\u4e86 select \u8bed\u53e5\uff0c\u5373\u8ba1\u7b97\u4e86 all_num\uff0c\u7136\u540e\u518d\u6267\u884c having \u5b50\u53e5\uff0c\u5bf9\u5206\u7ec4\u540e\u7684\u7ed3\u679c\u8fdb\u884c\u4e86\u7b5b\u9009\u3002<\/p>\n<p><strong>\u539f\u56e0<\/strong><\/p>\n<p>\u8fd9\u79cd\u73b0\u8c61\u80cc\u540e\u7684\u539f\u56e0\u5e76\u975e having \u5b50\u53e5\u4f18\u5148\u6267\u884c\uff0c\u800c\u662f\u56e0\u4e3a select \u8bed\u53e5\u5728 sql \u4e2d\u5177\u6709\u53cc\u91cd\u4f5c\u7528\u3002<\/p>\n<p>\u4e00\u65b9\u9762\uff0cselect \u5b50\u53e5\u53ef\u4ee5\u7528\u4e8e\u9009\u62e9\u8981\u663e\u793a\u7684\u5217\u3002\u4f46\u5728\u672c\u4f8b\u4e2d\uff0cselect \u8bed\u53e5\u6ca1\u6709\u9009\u62e9\u4efb\u4f55\u73b0\u6709\u5217\uff0c\u800c\u662f\u751f\u6210\u4e86\u4e00\u4e2a\u65b0\u5217 all_num\u3002\u56e0\u6b64\uff0c\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cselect \u8bed\u53e5\u4e0d\u6267\u884c\u4efb\u4f55\u9009\u62e9\u6027\u64cd\u4f5c\u3002<\/p>\n<p>\u53e6\u4e00\u65b9\u9762\uff0cselect \u8bed\u53e5\u4e5f\u53ef\u4ee5\u7528\u4e8e\u805a\u5408\u51fd\u6570\u3002\u672c\u4f8b\u4e2d\uff0cselect \u8bed\u53e5\u8ba1\u7b97\u4e86\u6bcf\u4e2a\u7ec4\u7684 num \u5217\u7684\u603b\u548c\uff0c\u5e76\u5c06\u7ed3\u679c\u5b58\u50a8\u5728 all_num \u5217\u4e2d\u3002\u56e0\u6b64\uff0c\u5728\u6b64\u573a\u666f\u4e0b\uff0cselect \u8bed\u53e5\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u805a\u5408\u64cd\u4f5c\u3002<\/p>\n<p><strong>\u6267\u884c\u987a\u5e8f<\/strong><\/p>\n<p>\u5f53 select \u8bed\u53e5\u5305\u542b\u805a\u5408\u51fd\u6570\u65f6\uff0csql \u5f15\u64ce\u7684\u6267\u884c\u987a\u5e8f\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u5206\u7ec4\uff08group by \u5b50\u53e5\uff09<\/li>\n<li>\u805a\u5408\uff08select \u5b50\u53e5\u4e2d\u7684\u805a\u5408\u51fd\u6570\uff09<\/li>\n<li>\u7b5b\u9009\uff08having \u5b50\u53e5\uff09<\/li>\n<li>\u9009\u62e9\uff08select \u5b50\u53e5\u9009\u62e9\u8981\u663e\u793a\u7684\u5217\uff09<\/li>\n<\/ol>\n<p>\u56e0\u6b64\uff0c\u5728\u793a\u4f8b\u4ee3\u7801\u4e2d\uff0c\u6b63\u786e\u7684\u6267\u884c\u987a\u5e8f\u662f\uff1a<\/p>\n<ol>\n<li>\u6309 id \u5217\u5206\u7ec4<\/li>\n<li>\u8ba1\u7b97\u6bcf\u4e2a\u7ec4\u7684 num \u5217\u7684\u603b\u548c\uff0c\u5e76\u5c06\u5176\u5b58\u50a8\u5728 all_num \u5217\u4e2d<\/li>\n<li>\u7b5b\u9009\u51fa all_num \u5927\u4e8e 50 \u7684\u7ec4<\/li>\n<li>\u9009\u62e9 all_num \u5217\u663e\u793a\u7ed3\u679c<\/li>\n<\/ol>\n<p>\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300aSQL \u5b50\u53e5\u6267\u884c\u987a\u5e8f\uff1a\u5148 HAVING \u8fd8\u662f\u5148 SELECT\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>SQL \u5b50\u53e5\u6267\u884c\u987a\u5e8f\uff1a\u5148 HAV&#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-200784","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200784","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=200784"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200784\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200784"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200784"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200784"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}