{"id":27850,"date":"2024-11-24T14:30:03","date_gmt":"2024-11-24T06:30:03","guid":{"rendered":"https:\/\/fwq.ai\/blog\/27850\/"},"modified":"2024-11-24T14:30:03","modified_gmt":"2024-11-24T06:30:03","slug":"sql%e4%b8%ad%e7%9a%84having%e5%ad%90%e5%8f%a5%e5%92%8cselect%e5%ad%90%e5%8f%a5%ef%bc%8c%e7%a9%b6%e7%ab%9f%e5%93%aa%e4%b8%aa%e5%85%88%e6%89%a7%e8%a1%8c%ef%bc%9f-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/27850\/","title":{"rendered":"SQL\u4e2d\u7684having\u5b50\u53e5\u548cselect\u5b50\u53e5\uff0c\u7a76\u7adf\u54ea\u4e2a\u5148\u6267\u884c\uff1f"},"content":{"rendered":"

\"SQL\u4e2d\u7684having\u5b50\u53e5\u548cselect\u5b50\u53e5\uff0c\u7a76\u7adf\u54ea\u4e2a\u5148\u6267\u884c\uff1f\u63d2\u56fe\"<\/p>\n

SQL\u6267\u884c\u987a\u5e8f\uff1ahaving\u4e0eselect<\/strong><\/p>\n

\u5728SQL\u8bed\u53e5\u4e2d\uff0c\u5148\u6267\u884c\u54ea\u4e00\u4e2a\u5b50\u53e5\uff0chaving\u8fd8\u662fselect\uff0c\u4e00\u76f4\u4ee5\u6765\u662f\u4e00\u4e2a\u5907\u53d7\u4e89\u8bae\u7684\u8bdd\u9898\u3002<\/p>\n

\u9488\u5bf9\u8fd9\u4e2a\u95ee\u9898\uff0c\u4f20\u7edf\u7684\u89c2\u70b9\u8ba4\u4e3aSQL\u4f1a\u5148\u6267\u884chaving\u5b50\u53e5\uff0c\u518d\u6267\u884cselect\u5b50\u53e5\u3002\u7136\u800c\uff0c\u6709\u4eba\u63d0\u51fa\u7591\u95ee\uff0c\u8fd9\u8fdd\u80cc\u4e86SQL\u7684\u903b\u8f91\u3002\u56e0\u4e3ahaving\u5b50\u53e5\u4f9d\u8d56\u4e8eselect\u5b50\u53e5\u7684\u7ed3\u679c\uff0c\u5373\u5206\u7ec4\u540e\u7684\u6c47\u603b\u6570\u636e\u6765\u8fdb\u884c\u7b5b\u9009\u3002\u90a3\u4e48\uff0c\u5982\u679c\u6ca1\u6709select\u5b50\u53e5\u5148\u67e5\u8be2\u51fa\u6570\u636e\u6765\uff0chaving\u5b50\u53e5\u53c8\u5982\u4f55\u8fdb\u884c\u7b5b\u9009\u5462\uff1f<\/p>\n

\u4e3a\u4e86\u6f84\u6e05\u8fd9\u4e2a\u7591\u95ee\uff0c\u6211\u4eec\u91cd\u65b0\u5ba1\u89c6select\u5b50\u53e5\u7684\u4f5c\u7528\u3002select\u5b50\u53e5\u5e76\u4e0d\u662f\u5bf9\u6570\u636e\u8fdb\u884c\u64cd\u4f5c\uff0c\u800c\u662f\u5c06\u9009\u53d6\u7684\u6570\u636e\u5c55\u793a\u51fa\u6765\u3002\u5b83\u4e0d\u53c2\u4e0e\u6570\u636e\u5904\u7406\u548c\u7b5b\u9009\u7684\u8fc7\u7a0b\uff0c\u56e0\u6b64\u4e0d\u4f1a\u5f71\u54cdhaving\u5b50\u53e5\u7684\u6267\u884c\u3002<\/p>\n

\u56e0\u6b64\uff0cSQL\u6267\u884c\u7684\u6b63\u786e\u987a\u5e8f\u5e94\u8be5\u662f\uff1a<\/p>\n

    \n
  1. Group by\u5148\u8fdb\u884c\u5206\u7ec4\u3002<\/li>\n
  2. Sum()\u8ba1\u7b97\u6bcf\u4e2a\u7ec4\u7684\u603b\u548c\u3002<\/li>\n
  3. Having\u5b50\u53e5\u5bf9\u5b50\u7ec4\u603b\u548c\u7ed3\u679c\u8fdb\u884c\u7b5b\u9009\u3002<\/li>\n
  4. Select\u5c06\u7b26\u5408\u7b5b\u9009\u6761\u4ef6\u7684\u7ed3\u679c\u9009\u62e9\u6027\u5730\u5c55\u793a\u51fa\u6765\u3002<\/li>\n<\/ol>\n

    \u6240\u4ee5\uff0c\u7f51\u4e0a\u7684\u7b54\u6848\u662f\u6b63\u786e\u7684\uff0cSQL\u4e2d\u5148\u6267\u884chaving\u5b50\u53e5\uff0c\u518d\u6267\u884cselect\u5b50\u53e5\u3002\u8fd9\u5e76\u4e0d\u77db\u76fe\uff0c\u56e0\u4e3ahaving\u5b50\u53e5\u5e76\u4e0d\u4f9d\u8d56\u4e8eselect\u5b50\u53e5\u7684\u6267\u884c\u7ed3\u679c\u6765\u8fdb\u884c\u7b5b\u9009\u3002<\/p>\n

    \u4ee5\u4e0a\u5c31\u662fSQL\u4e2d\u7684having\u5b50\u53e5\u548cselect\u5b50\u53e5\uff0c\u7a76\u7adf\u54ea\u4e2a\u5148\u6267\u884c\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"

    SQL\u6267\u884c\u987a\u5e8f\uff1ahaving\u4e0eselect \u5728SQL\u8bed\u53e5\u4e2d\uff0c\u5148\u6267\u884c\u54ea\u4e00\u4e2a\u5b50\u53e5\uff0chaving\u8fd8\u662fselect\uff0c\u4e00\u76f4\u4ee5\u6765\u662f\u4e00\u4e2a\u5907\u53d7\u4e89\u8bae\u7684\u8bdd\u9898\u3002 \u9488\u5bf9\u8fd9\u4e2a\u95ee\u9898\uff0c\u4f20\u7edf\u7684\u89c2\u70b9\u8ba4\u4e3aSQL\u4f1a\u5148\u6267\u884chaving\u5b50\u53e5\uff0c\u518d\u6267\u884cselect\u5b50\u53e5\u3002\u7136\u800c\uff0c\u6709\u4eba\u63d0\u51fa\u7591\u95ee\uff0c\u8fd9\u8fdd\u80cc\u4e86SQL\u7684\u903b\u8f91\u3002\u56e0\u4e3ahaving\u5b50\u53e5\u4f9d\u8d56\u4e8eselect\u5b50\u53e5\u7684\u7ed3\u679c\uff0c\u5373\u5206\u7ec4\u540e\u7684\u6c47\u603b\u6570\u636e\u6765\u8fdb\u884c\u7b5b\u9009\u3002\u90a3\u4e48\uff0c\u5982\u679c\u6ca1\u6709select\u5b50\u53e5\u5148\u67e5\u8be2\u51fa\u6570\u636e\u6765\uff0chaving\u5b50\u53e5\u53c8\u5982\u4f55\u8fdb\u884c\u7b5b\u9009\u5462\uff1f \u4e3a\u4e86\u6f84\u6e05\u8fd9\u4e2a\u7591\u95ee\uff0c\u6211\u4eec\u91cd\u65b0\u5ba1\u89c6select\u5b50\u53e5\u7684\u4f5c\u7528\u3002select\u5b50\u53e5\u5e76\u4e0d\u662f\u5bf9\u6570\u636e\u8fdb\u884c\u64cd\u4f5c\uff0c\u800c\u662f\u5c06\u9009\u53d6\u7684\u6570\u636e\u5c55\u793a\u51fa\u6765\u3002\u5b83\u4e0d\u53c2\u4e0e\u6570\u636e\u5904\u7406\u548c\u7b5b\u9009\u7684\u8fc7\u7a0b\uff0c\u56e0\u6b64\u4e0d\u4f1a\u5f71\u54cdhaving\u5b50\u53e5\u7684\u6267\u884c\u3002 \u56e0\u6b64\uff0cSQL\u6267\u884c\u7684\u6b63\u786e\u987a\u5e8f\u5e94\u8be5\u662f\uff1a Group by\u5148\u8fdb\u884c\u5206\u7ec4\u3002 Sum()\u8ba1\u7b97\u6bcf\u4e2a\u7ec4\u7684\u603b\u548c\u3002 Having\u5b50\u53e5\u5bf9\u5b50\u7ec4\u603b\u548c\u7ed3\u679c\u8fdb\u884c\u7b5b\u9009\u3002 Select\u5c06\u7b26\u5408\u7b5b\u9009\u6761\u4ef6\u7684\u7ed3\u679c\u9009\u62e9\u6027\u5730\u5c55\u793a\u51fa\u6765\u3002 \u6240\u4ee5\uff0c\u7f51\u4e0a\u7684\u7b54\u6848\u662f\u6b63\u786e\u7684\uff0cSQL\u4e2d\u5148\u6267\u884chaving\u5b50\u53e5\uff0c\u518d\u6267\u884cselect\u5b50\u53e5\u3002\u8fd9\u5e76\u4e0d\u77db\u76fe\uff0c\u56e0\u4e3ahaving\u5b50\u53e5\u5e76\u4e0d\u4f9d\u8d56\u4e8eselect\u5b50\u53e5\u7684\u6267\u884c\u7ed3\u679c\u6765\u8fdb\u884c\u7b5b\u9009\u3002 \u4ee5\u4e0a\u5c31\u662fSQL\u4e2d\u7684having\u5b50\u53e5\u548cselect\u5b50\u53e5\uff0c\u7a76\u7adf\u54ea\u4e2a\u5148\u6267\u884c\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\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-27850","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/27850","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=27850"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/27850\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=27850"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=27850"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=27850"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}