{"id":6917,"date":"2024-11-14T14:52:29","date_gmt":"2024-11-14T06:52:29","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6917\/"},"modified":"2024-11-14T14:52:29","modified_gmt":"2024-11-14T06:52:29","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-mysql-%e6%9f%a5%e8%af%a2%e5%ae%9e%e7%8e%b0%e5%88%86%e7%bb%84%e7%bb%93%e6%9e%9c%e5%b9%b6%e8%a1%8c%e5%b1%95%e7%a4%ba%e4%b8%8a%e5%8d%8a%e5%b9%b4%e5%92%8c%e4%b8%8b","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6917\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 MySQL \u67e5\u8be2\u5b9e\u73b0\u5206\u7ec4\u7ed3\u679c\u5e76\u884c\u5c55\u793a\u4e0a\u534a\u5e74\u548c\u4e0b\u534a\u5e74\u7edf\u8ba1\u503c\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173007757884622.jpg\" class=\"aligncenter\" title=\"\u5982\u4f55\u4f7f\u7528 MySQL \u67e5\u8be2\u5b9e\u73b0\u5206\u7ec4\u7ed3\u679c\u5e76\u884c\u5c55\u793a\u4e0a\u534a\u5e74\u548c\u4e0b\u534a\u5e74\u7edf\u8ba1\u503c\uff1f\u63d2\u56fe\" alt=\"\u5982\u4f55\u4f7f\u7528 MySQL \u67e5\u8be2\u5b9e\u73b0\u5206\u7ec4\u7ed3\u679c\u5e76\u884c\u5c55\u793a\u4e0a\u534a\u5e74\u548c\u4e0b\u534a\u5e74\u7edf\u8ba1\u503c\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong> \u67e5\u8be2\u7ed3\u679c\u5206\u7ec4\u5e76\u884c\u5c55\u793a<\/strong><\/p>\n<p>\u5bf9\u4e8e\u5206\u7ec4\u67e5\u8be2\u5e76\u884c\u5c55\u793a\u7684\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528 group by \u548c left join \u8054\u5408\u5b9e\u73b0\u3002<\/p>\n<p>\u672c\u4f8b\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u6839\u636e name \u548c start_date \u5bf9\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u5206\u7ec4\uff0c\u5e76\u5c06\u4e0a\u534a\u5e74\u548c\u4e0b\u534a\u5e74\u7684\u7edf\u8ba1 num \u6c42\u548c\u5c55\u793a\u5728\u540c\u4e00\u884c\u3002<\/p>\n<p>\u4ee5\u4e0b sql \u67e5\u8be2\u53ef\u4ee5\u5b9e\u73b0\u4e0a\u8ff0\u9700\u6c42\uff1a<\/p>\n<pre>SELECT\n    t.name,\n    start_date,\n    SUM( t.num ) AS shang_sum,\n    IFNULL(t2.xia_sum,0)\nFROM\n    `task` t\n    LEFT JOIN ( SELECT NAME, SUM( num ) xia_sum FROM task WHERE MONTH ( start_date ) &lt; 7 GROUP BY `name` ) t2 ON t2.NAME = t.NAME \nWHERE\n    MONTH ( start_date ) &gt;= 7 \nGROUP BY\n    `name`<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u8be5\u67e5\u8be2\u9996\u5148\u4f7f\u7528 group by \u5bf9\u7ed3\u679c\u6309\u7167 name \u8fdb\u884c\u5206\u7ec4\uff0c\u5e76\u8ba1\u7b97\u4e0a\u534a\u5e74\u7684 num \u6c42\u548c\u3002\u7136\u540e\u4f7f\u7528 left join \u5de6\u8fde\u63a5\u53e6\u4e00\u4e2a\u5b50\u67e5\u8be2\uff0c\u8be5\u5b50\u67e5\u8be2\u4ece\u6ee1\u8db3 start_date \u5728\u4e0a\u534a\u5e74\u7684 task \u8868\u4e2d\u8ba1\u7b97\u4e0b\u534a\u5e74\u7684 num \u6c42\u548c\u3002\u6700\u540e\uff0cifnull \u51fd\u6570\u7528\u4e8e\u5904\u7406\u4e0b\u534a\u5e74\u7684\u6c42\u548c\u7ed3\u679c\u4e3a null \u7684\u60c5\u51b5\uff0c\u5c06\u5176\u66ff\u6362\u4e3a 0\u3002<\/p>\n<p>\u6267\u884c\u8be5\u67e5\u8be2\u540e\uff0c\u5c06\u8f93\u51fa\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>name<\/th>\n<th>start_date<\/th>\n<th>shang_sum<\/th>\n<th>xia_sum<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ceshi<\/td>\n<td>\u4e0a\u534a\u5e74<\/td>\n<td>3<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>sss<\/td>\n<td>\u4e0b\u534a\u5e74<\/td>\n<td>0<\/td>\n<td>2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u4f7f\u7528 MySQL \u67e5\u8be2\u5b9e\u73b0\u5206\u7ec4\u7ed3\u679c\u5e76\u884c\u5c55\u793a\u4e0a\u534a\u5e74\u548c\u4e0b\u534a\u5e74\u7edf\u8ba1\u503c\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":"<p>\u67e5\u8be2\u7ed3\u679c\u5206\u7ec4\u5e76\u884c\u5c55\u793a \u5bf9\u4e8e\u5206\u7ec4\u67e5\u8be2\u5e76\u884c\u5c55\u793a\u7684\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528 group by \u548c left join \u8054\u5408\u5b9e\u73b0\u3002 \u672c\u4f8b\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u6839\u636e name \u548c start_date \u5bf9\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u5206\u7ec4\uff0c\u5e76\u5c06\u4e0a\u534a\u5e74\u548c\u4e0b\u534a\u5e74\u7684\u7edf\u8ba1 num \u6c42\u548c\u5c55\u793a\u5728\u540c\u4e00\u884c\u3002 \u4ee5\u4e0b sql \u67e5\u8be2\u53ef\u4ee5\u5b9e\u73b0\u4e0a\u8ff0\u9700\u6c42\uff1a SELECT t.name, start_date, SUM( t.num ) AS shang_sum, IFNULL(t2.xia_sum,0) FROM `task` t LEFT JOIN ( SELECT NAME, SUM( num ) xia_sum FROM task WHERE MONTH ( start_date ) &lt; 7 GROUP BY `name` ) t2 ON t2.NAME [&hellip;]<\/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-6917","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6917","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=6917"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6917\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6917"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6917"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6917"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}