{"id":6670,"date":"2024-11-14T14:48:00","date_gmt":"2024-11-14T06:48:00","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6670\/"},"modified":"2024-11-14T14:48:00","modified_gmt":"2024-11-14T06:48:00","slug":"group-by%e6%98%af%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9d","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6670\/","title":{"rendered":"group by\u662f\u4ec0\u4e48\u610f\u601d"},"content":{"rendered":"

\n sql\u4e2d\u7684group by\u53ef\u6309\u6307\u5b9a\u5b57\u6bb5\u5206\u7ec4\uff0c\u805a\u5408\u6570\u636e\u5e76\u663e\u793a\u5206\u7ec4\u7ed3\u679c\u3002\u5177\u4f53\u6b65\u9aa4\u5982\u4e0b\uff1a\u4f7f\u7528group by\u5173\u952e\u5b57\u540e\u8ddf\u5b57\u6bb5\u540d\uff0c\u5c06\u6570\u636e\u96c6\u6309\u8be5\u5b57\u6bb5\u5206\u7ec4\u3002\u4f7f\u7528\u805a\u5408\u51fd\u6570\uff08\u5982sum\uff09\u5bf9\u6bcf\u4e2a\u7ec4\u8ba1\u7b97\u503c\u3002\u9009\u62e9\u8981\u8fd4\u56de\u7684\u5217\uff0c\u5305\u62ec\u5206\u7ec4\u5b57\u6bb5\u548c\u805a\u5408\u7ed3\u679c\u3002\u8fd4\u56de\u5206\u7ec4\u7ed3\u679c\uff0c\u6bcf\u884c\u4ee3\u8868\u4e00\u4e2a\u5206\u7ec4\u3002\n<\/p><\/blockquote>\n

\"group<\/p>\n

GROUP BY\uff1a\u6309\u5b57\u6bb5\u5206\u7ec4<\/strong><\/p>\n

\u5b9a\u4e49\uff1a<\/strong><\/p>\n

GROUP BY \u662f SQL \u4e2d\u7528\u4e8e\u6309\u6307\u5b9a\u5b57\u6bb5\u5c06\u6570\u636e\u96c6\u5206\u7ec4\u7684\u5173\u952e\u5b57\u3002\u901a\u8fc7\u5206\u7ec4\uff0c\u6211\u4eec\u53ef\u4ee5\u805a\u5408\u76f8\u4f3c\u6570\u636e\u5e76\u663e\u793a\u5206\u7ec4\u7ed3\u679c\u3002<\/p>\n

\u8bed\u6cd5\uff1a<\/strong><\/p>\n

SELECT \u5217\u540d, \u805a\u5408\u51fd\u6570(\u5b57\u6bb5\u540d)\nFROM \u8868\u540d\nGROUP BY \u5b57\u6bb5\u540d<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u529f\u80fd\uff1a<\/strong><\/p>\n
GROUP BY \u7684\u4e3b\u8981\u529f\u80fd\u662f\uff1a<\/p>\n
    \n
  • \u6309\u6307\u5b9a\u5b57\u6bb5\u5c06\u6570\u636e\u96c6\u4e2d\u7684\u8bb0\u5f55\u5206\u7ec4\u5230\u4e0d\u540c\u7684\u96c6\u5408\u4e2d\u3002<\/li>\n
  • \u5bf9\u6bcf\u4e2a\u5206\u7ec4\u6267\u884c\uff0c\u5982\u6c42\u548c\u3001\u6c42\u5e73\u5747\u503c\u6216\u8ba1\u7b97\u6570\u91cf\u3002<\/li>\n
  • \u5c06\u5206\u7ec4\u7ed3\u679c\u4f5c\u4e3a\u65b0\u8868\u4e2d\u7684\u884c\u8fd4\u56de\u3002<\/li>\n<\/ul>\n
    \u793a\u4f8b\uff1a<\/strong><\/p>\n
    \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u8868\u683c\u5305\u542b\u5458\u5de5\u53ca\u5176\u9500\u552e\u989d\uff1a<\/p>\n\n\n\n\n\n\n\n\n
    \u5458\u5de5\u59d3\u540d<\/th>\n\u9500\u552e\u989d<\/th>\n<\/tr>\n<\/thead>\n
    John Doe<\/td>\n500<\/td>\n<\/tr>\n
    Jane Smith<\/td>\n300<\/td>\n<\/tr>\n
    John Doe<\/td>\n200<\/td>\n<\/tr>\n
    Jane Smith<\/td>\n400<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \u4ee5\u4e0b\u67e5\u8be2\u6309\u5458\u5de5\u59d3\u540d\u5206\u7ec4\uff0c\u5e76\u8ba1\u7b97\u6bcf\u4f4d\u5458\u5de5\u7684\u603b\u9500\u552e\u989d\uff1a<\/p>\n
    SELECT \u5458\u5de5\u59d3\u540d, SUM(\u9500\u552e\u989d)\nFROM \u9500\u552e\u8868\nGROUP BY \u5458\u5de5\u59d3\u540d<\/pre>\n
     \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \u7ed3\u679c\uff1a<\/strong><\/p>\n\n\n\n\n\n\n
    \u5458\u5de5\u59d3\u540d<\/th>\n\u603b\u9500\u552e\u989d<\/th>\n<\/tr>\n<\/thead>\n
    John Doe<\/td>\n700<\/td>\n<\/tr>\n
    Jane Smith<\/td>\n700<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n
      \n
    • \u5fc5\u987b\u5728 GROUP BY \u5b50\u53e5\u4e2d\u4f7f\u7528\u7684\u5b57\u6bb5\u5fc5\u987b\u51fa\u73b0\u5728 SELECT \u5b50\u53e5\u4e2d\u3002<\/li>\n
    • \u53ef\u4ee5\u6309\u591a\u4e2a\u5b57\u6bb5\u5206\u7ec4\uff0c\u4f7f\u7528\u9017\u53f7\u5206\u9694\u5b83\u4eec\u3002<\/li>\n
    • \u5982\u679c\u672a\u6307\u5b9a GROUP BY \u5b50\u53e5\uff0c\u5219\u6574\u4e2a\u6570\u636e\u96c6\u5c06\u88ab\u89c6\u4e3a\u4e00\u4e2a\u7ec4\u3002<\/li>\n<\/ul>\n
      \u4ee5\u4e0a\u5c31\u662fgroup by\u662f\u4ec0\u4e48\u610f\u601d\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":"
      sql\u4e2d\u7684group by\u53ef\u6309\u6307\u5b9a\u5b57\u6bb5\u5206\u7ec4\uff0c\u805a\u5408\u6570\u636e\u5e76\u663e\u793a\u5206\u7ec4\u7ed3\u679c\u3002\u5177\u4f53\u6b65\u9aa4\u5982\u4e0b\uff1a\u4f7f\u7528group by\u5173\u952e\u5b57\u540e\u8ddf\u5b57\u6bb5\u540d\uff0c\u5c06\u6570\u636e\u96c6\u6309\u8be5\u5b57\u6bb5\u5206\u7ec4\u3002\u4f7f\u7528\u805a\u5408\u51fd\u6570\uff08\u5982sum\uff09\u5bf9\u6bcf\u4e2a\u7ec4\u8ba1\u7b97\u503c\u3002\u9009\u62e9\u8981\u8fd4\u56de\u7684\u5217\uff0c\u5305\u62ec\u5206\u7ec4\u5b57\u6bb5\u548c\u805a\u5408\u7ed3\u679c\u3002\u8fd4\u56de\u5206\u7ec4\u7ed3\u679c\uff0c\u6bcf\u884c\u4ee3\u8868\u4e00\u4e2a\u5206\u7ec4\u3002 GROUP BY\uff1a\u6309\u5b57\u6bb5\u5206\u7ec4 \u5b9a\u4e49\uff1a GROUP BY \u662f SQL \u4e2d\u7528\u4e8e\u6309\u6307\u5b9a\u5b57\u6bb5\u5c06\u6570\u636e\u96c6\u5206\u7ec4\u7684\u5173\u952e\u5b57\u3002\u901a\u8fc7\u5206\u7ec4\uff0c\u6211\u4eec\u53ef\u4ee5\u805a\u5408\u76f8\u4f3c\u6570\u636e\u5e76\u663e\u793a\u5206\u7ec4\u7ed3\u679c\u3002 \u8bed\u6cd5\uff1a SELECT \u5217\u540d, \u805a\u5408\u51fd\u6570(\u5b57\u6bb5\u540d) FROM \u8868\u540d GROUP BY \u5b57\u6bb5\u540d \u767b\u5f55\u540e\u590d\u5236 \u529f\u80fd\uff1a GROUP BY \u7684\u4e3b\u8981\u529f\u80fd\u662f\uff1a \u6309\u6307\u5b9a\u5b57\u6bb5\u5c06\u6570\u636e\u96c6\u4e2d\u7684\u8bb0\u5f55\u5206\u7ec4\u5230\u4e0d\u540c\u7684\u96c6\u5408\u4e2d\u3002 \u5bf9\u6bcf\u4e2a\u5206\u7ec4\u6267\u884c\uff0c\u5982\u6c42\u548c\u3001\u6c42\u5e73\u5747\u503c\u6216\u8ba1\u7b97\u6570\u91cf\u3002 \u5c06\u5206\u7ec4\u7ed3\u679c\u4f5c\u4e3a\u65b0\u8868\u4e2d\u7684\u884c\u8fd4\u56de\u3002 \u793a\u4f8b\uff1a \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u8868\u683c\u5305\u542b\u5458\u5de5\u53ca\u5176\u9500\u552e\u989d\uff1a \u5458\u5de5\u59d3\u540d \u9500\u552e\u989d John Doe 500 Jane Smith 300 John Doe 200 Jane Smith 400 \u4ee5\u4e0b\u67e5\u8be2\u6309\u5458\u5de5\u59d3\u540d\u5206\u7ec4\uff0c\u5e76\u8ba1\u7b97\u6bcf\u4f4d\u5458\u5de5\u7684\u603b\u9500\u552e\u989d\uff1a SELECT \u5458\u5de5\u59d3\u540d, SUM(\u9500\u552e\u989d) FROM \u9500\u552e\u8868 GROUP BY \u5458\u5de5\u59d3\u540d \u767b\u5f55\u540e\u590d\u5236 \u7ed3\u679c\uff1a […]<\/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-6670","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6670","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=6670"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6670\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6670"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6670"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6670"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}