{"id":123671,"date":"2026-11-08T01:00:58","date_gmt":"2026-11-07T17:00:58","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/123671.html"},"modified":"2026-11-08T01:00:58","modified_gmt":"2026-11-07T17:00:58","slug":"mysql-group-by-%e5%be%88%e6%85%a2%e6%80%8e%e4%b9%88%e4%bc%98%e5%8c%96%ef%bc%9a%e5%8a%a0%e4%ba%86%e7%b4%a2%e5%bc%95%e5%8f%8d%e8%80%8c%e4%bb%8e-1-%e7%a7%92%e5%8f%98-7-%e7%a7%92%ef%bc%8cusing-temporary","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/123671.html","title":{"rendered":"MySQL GROUP BY \u5f88\u6162\u600e\u4e48\u4f18\u5316\uff1a\u52a0\u4e86\u7d22\u5f15\u53cd\u800c\u4ece 1 \u79d2\u53d8 7 \u79d2\uff0cUsing temporary \u8be5\u4e0d\u8be5\u6d88\uff08MySQL 8.2 \u5b9e\u6d4b 400 \u4e07\u884c\uff09"},"content":{"rendered":"<p>        \/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/<br \/>\n        #content_views .toc,<br \/>\n        \/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/<br \/>\n        #content_views.markdown_views &gt; p:empty:has(+ .toc),<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty,<br \/>\n        \/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/<br \/>\n        #content_views.htmledit_views #main-toc,<br \/>\n        #content_views.htmledit_views #hr-toc,<br \/>\n        #content_views.htmledit_views p[id*=\\&#8221;-toc\\&#8221;] {<br \/>\n          display: none !important;<br \/>\n        }<br \/>\n        \/* \u76ee\u5f55\u53bb\u6389\u540e\uff0c\u7d27\u8ddf\u7684\u9996\u4e2a\u6807\u9898\u4e0d\u518d\u591a\u51fa\u4e00\u5757\u4e0a\u8fb9\u8ddd *\/<br \/>\n        #content_views.markdown_views &gt; .toc + h1,<br \/>\n        #content_views.markdown_views &gt; .toc + h2,<br \/>\n        #content_views.markdown_views &gt; .toc + h3,<br \/>\n        #content_views.markdown_views &gt; .toc + h4,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h1,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h2,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h3,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h4 {<br \/>\n          margin-top: 0 !important;<br \/>\n        }<\/p>\n<p>\u5bfc\u8bfb&#xff1a;GROUP BY \u6162&#xff0c;\u7f51\u4e0a\u6700\u5e38\u89c1\u7684\u5efa\u8bae\u662f&#034;\u7ed9\u5206\u7ec4\u5b57\u6bb5\u52a0\u7d22\u5f15&#xff0c;\u6d88\u6389 Using temporary&#034;\u3002\u6211\u5728 MySQL 8.2 \u4e0a\u62ff 400 \u4e07\u884c\u8ba2\u5355\u8868\u7167\u7740\u505a&#xff0c;\u6309\u5e97\u94fa\u7edf\u8ba1\u91d1\u989d\u7684\u67e5\u8be2\u4ece 1.1 \u79d2\u53d8\u6210\u4e86 6.9 \u79d2\u3002\u8fd9\u7bc7\u628a GROUP BY \u5e38\u89c1\u7684\u51e0\u79cd\u5199\u6cd5\u90fd\u8dd1\u4e86\u4e00\u904d&#xff1a;\u4ec0\u4e48\u65f6\u5019\u52a0\u7d22\u5f15\u6709\u7528\u3001\u4ec0\u4e48\u65f6\u5019\u53cd\u800c\u66f4\u6162\u3001\u5e26\u65f6\u95f4\u8303\u56f4\u7684\u7edf\u8ba1\u7d22\u5f15\u600e\u4e48\u5efa\u3001\u5206\u7ec4\u6570\u5f88\u591a\u65f6\u4e34\u65f6\u8868\u843d\u76d8\u6709\u591a\u6162\u3001\u6392\u884c\u699c\u7c7b\u67e5\u8be2\u4ec0\u4e48\u65f6\u5019\u8be5\u4e0a\u6c47\u603b\u8868\u3002<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u5148\u8bf4\u6e05\u695a&#xff1a;GROUP BY \u6162\u5728\u54ea<\/h3>\n<p>GROUP BY \u8981\u505a\u7684\u4e8b\u5f88\u7b80\u5355&#xff1a;\u628a\u884c\u6309\u67d0\u4e00\u5217\u5f52\u5806&#xff0c;\u6bcf\u5806\u7b97\u4e00\u4e2a COUNT \u6216 SUM\u3002MySQL \u6709\u4e24\u79cd\u5f52\u5806\u7684\u529e\u6cd5&#xff1a;<\/p>\n<ul>\n<li>\u8fb9\u626b\u8fb9\u5efa\u4e00\u5f20\u4e34\u65f6\u8868&#xff1a;\u626b\u5230\u4e00\u884c&#xff0c;\u5c31\u53bb\u4e34\u65f6\u8868\u91cc\u627e\u5b83\u7684\u5206\u7ec4&#xff0c;\u627e\u5230\u5c31\u7d2f\u52a0&#xff0c;\u6ca1\u6709\u5c31\u65b0\u5efa\u4e00\u884c\u3002EXPLAIN \u91cc\u663e\u793a Using temporary<\/li>\n<li>\u6309\u7d22\u5f15\u987a\u5e8f\u626b&#xff1a;\u5982\u679c\u6709\u4e00\u4e2a\u4ee5\u5206\u7ec4\u5217\u5f00\u5934\u7684\u7d22\u5f15&#xff0c;\u6570\u636e\u672c\u6765\u5c31\u662f\u6309\u5206\u7ec4\u6392\u597d\u7684&#xff0c;\u626b\u5b8c\u4e00\u7ec4\u5c31\u51fa\u4e00\u7ec4\u7ed3\u679c&#xff0c;\u4e0d\u9700\u8981\u4e34\u65f6\u8868<\/li>\n<\/ul>\n<p>\u4e0d\u7ba1\u5b83\u4f1a\u600e\u6837&#xff1f;\u8868\u5c0f\u7684\u65f6\u5019\u4e24\u79cd\u529e\u6cd5\u90fd\u5f88\u5feb&#xff0c;\u6839\u672c\u611f\u89c9\u4e0d\u5230\u3002\u6570\u636e\u5230\u4e86\u51e0\u767e\u4e07\u884c&#xff0c;\u7edf\u8ba1\u62a5\u8868\u3001\u540e\u53f0\u9996\u9875\u7684&#034;\u9500\u91cf\u6392\u884c&#034;\u8fd9\u7c7b\u67e5\u8be2\u4f1a\u4ece\u51e0\u5341\u6beb\u79d2\u6da8\u5230\u597d\u51e0\u79d2&#xff0c;\u800c\u4e14\u662f\u6bcf\u6253\u5f00\u4e00\u6b21\u9875\u9762\u5c31\u626b\u4e00\u904d\u5168\u8868\u3002<\/p>\n<p>\u4ec0\u4e48\u65f6\u5019\u503c\u5f97\u52a8\u5b83&#xff1a;\u6162\u67e5\u8be2\u65e5\u5fd7\u91cc\u51fa\u73b0\u4e86\u5e26 GROUP BY \u7684\u8bed\u53e5&#xff0c;\u6216\u8005\u67d0\u4e2a\u7edf\u8ba1\u63a5\u53e3\u660e\u663e\u6bd4\u5176\u4ed6\u63a5\u53e3\u6162\u3002\u5148\u770b EXPLAIN \u518d\u51b3\u5b9a\u52a0\u4ec0\u4e48\u7d22\u5f15&#xff0c;\u4e0b\u9762\u4f1a\u770b\u5230&#xff0c;\u7167\u7740&#034;\u6d88\u6389 Using temporary&#034;\u53bb\u52a0\u7d22\u5f15&#xff0c;\u53ef\u80fd\u8ba9\u67e5\u8be2\u6162\u597d\u51e0\u500d\u3002<\/p>\n<hr \/>\n<h3>\u4e8c\u3001\u5b9e\u6d4b\u73af\u5883\u548c\u6570\u636e<\/h3>\n<table>\n<tr>\u9879\u503c<\/tr>\n<tbody>\n<tr>\n<td>MySQL<\/td>\n<td>8.2.0&#xff08;\u672c\u673a\u4e8c\u8fdb\u5236 &#043; \u5355\u72ec\u521d\u59cb\u5316\u7684\u6570\u636e\u76ee\u5f55&#xff0c;buffer pool 1 GB&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u673a\u5668<\/td>\n<td>Apple M1 Pro<\/td>\n<\/tr>\n<tr>\n<td>\u6570\u636e<\/td>\n<td>orders \u8868 400 \u4e07\u884c&#xff0c;\u6570\u636e\u6587\u4ef6\u7ea6 188 MB&#xff0c;\u5168\u90e8\u80fd\u653e\u8fdb buffer pool<\/td>\n<\/tr>\n<tr>\n<td>\u5206\u5e03<\/td>\n<td>2000 \u4e2a\u5e97\u94fa\u3001\u7ea6 50 \u4e07\u4e2a\u7528\u6237\u30015 \u79cd\u72b6\u6001\u3001\u91d1\u989d 0&#xff5e;1000\u3001\u4e0b\u5355\u65f6\u95f4\u5747\u5300\u5206\u5e03\u5728\u6700\u8fd1\u4e00\u5e74<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5efa\u8868\u548c\u9020\u6570\u636e\u7684 SQL&#xff1a;<\/p>\n<p><span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">TABLE<\/span> orders <span class=\"token punctuation\">(<\/span><br \/>\n  id <span class=\"token keyword\">BIGINT<\/span> <span class=\"token keyword\">PRIMARY<\/span> <span class=\"token keyword\">KEY<\/span> <span class=\"token keyword\">AUTO_INCREMENT<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  user_id <span class=\"token keyword\">INT<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  shop_id <span class=\"token keyword\">INT<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  <span class=\"token keyword\">status<\/span> <span class=\"token keyword\">TINYINT<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  amount <span class=\"token keyword\">DECIMAL<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  created_at <span class=\"token keyword\">DATETIME<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">ENGINE<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token keyword\">InnoDB<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u9012\u5f52 CTE \u4e00\u6b21\u751f\u6210 400 \u4e07\u884c&#xff0c;\u672c\u673a\u7ea6 20 \u79d2<\/span><br \/>\n<span class=\"token keyword\">SET<\/span> <span class=\"token keyword\">SESSION<\/span> cte_max_recursion_depth <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5000000<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> orders<span class=\"token punctuation\">(<\/span>user_id<span class=\"token punctuation\">,<\/span> shop_id<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">status<\/span><span class=\"token punctuation\">,<\/span> amount<span class=\"token punctuation\">,<\/span> created_at<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">WITH<\/span> RECURSIVE seq<span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">AS<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">SELECT<\/span> <span class=\"token number\">1<\/span> <span class=\"token keyword\">UNION<\/span> <span class=\"token keyword\">ALL<\/span> <span class=\"token keyword\">SELECT<\/span> n<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span> <span class=\"token keyword\">FROM<\/span> seq <span class=\"token keyword\">WHERE<\/span> n <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">4000000<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> FLOOR<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&#043;<\/span>RAND<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">*<\/span><span class=\"token number\">500000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> FLOOR<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&#043;<\/span>RAND<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">*<\/span><span class=\"token number\">2000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> FLOOR<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&#043;<\/span>RAND<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">*<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">ROUND<\/span><span class=\"token punctuation\">(<\/span>RAND<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">*<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n       <span class=\"token string\">&#039;2025-11-07&#039;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token keyword\">INTERVAL<\/span> FLOOR<span class=\"token punctuation\">(<\/span>RAND<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">*<\/span><span class=\"token number\">365<\/span><span class=\"token operator\">*<\/span><span class=\"token number\">86400<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">SECOND<\/span> <span class=\"token keyword\">FROM<\/span> seq<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u26a0\ufe0f \u9020\u6570\u636e\u65f6\u6211\u7b2c\u4e00\u6b21\u7528\u4e86 RAND(n)\u3001RAND(n&#043;7) \u8fd9\u79cd\u5e26\u79cd\u5b50\u7684\u5199\u6cd5&#xff0c;\u7ed3\u679c\u76f8\u90bb\u79cd\u5b50\u751f\u6210\u7684\u968f\u673a\u6570\u6709\u5173\u8054&#xff0c;&#034;\u6700\u8fd1\u4e00\u4e2a\u6708\u7684\u8ba2\u5355&#034;\u53ea\u843d\u5728 680 \u4e2a\u5e97\u94fa\u91cc&#xff0c;\u6570\u636e\u5206\u5e03\u660e\u663e\u4e0d\u5bf9\u3002\u6362\u6210\u4e0d\u5e26\u79cd\u5b50\u7684 RAND() \u624d\u6b63\u5e38&#xff08;\u6700\u8fd1\u4e00\u4e2a\u6708 40.6 \u4e07\u884c&#xff0c;2000 \u4e2a\u5e97\u94fa\u90fd\u6709&#xff09;\u3002\u81ea\u5df1\u9020\u6d4b\u8bd5\u6570\u636e\u65f6\u7559\u610f\u4e00\u4e0b\u3002<\/p>\n<p>\u6bcf\u6761\u67e5\u8be2\u8dd1 3 \u6b21&#xff0c;\u4e0b\u6587\u53d6\u540e\u4e24\u6b21\u7684\u8017\u65f6&#xff08;\u7b2c\u4e00\u6b21\u6709\u65f6\u504f\u6162&#xff09;\u3002\u6570\u636e\u90fd\u5728\u5185\u5b58\u91cc&#xff0c;\u6d4b\u7684\u662f CPU \u548c\u5185\u5b58\u8bbf\u95ee\u7684\u5f00\u9500&#xff0c;\u771f\u5b9e\u73af\u5883\u6570\u636e\u4e0d\u5728 buffer pool \u91cc\u65f6&#xff0c;\u56de\u8868\u7684\u4ee3\u4ef7\u4f1a\u66f4\u5927\u3002<\/p>\n<hr \/>\n<h3>\u4e09\u3001\u5751\u4e00&#xff1a;\u53ea\u7ed9\u5206\u7ec4\u5217\u52a0\u7d22\u5f15&#xff0c;SUM \u6162\u4e86 6 \u500d<\/h3>\n<p>\u5148\u770b\u6700\u7b80\u5355\u7684\u6309\u5e97\u94fa\u8ba1\u6570&#xff0c;\u6ca1\u6709\u7d22\u5f15\u65f6&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> shop_id<span class=\"token punctuation\">,<\/span> <span class=\"token function\">COUNT<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">FROM<\/span> orders <span class=\"token keyword\">GROUP<\/span> <span class=\"token keyword\">BY<\/span> shop_id<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">&#8212; EXPLAIN: type&#061;ALL  Extra: Using temporary<\/span><\/p>\n<p>0.82 \u79d2\u3002\u6309\u5e38\u89c1\u5efa\u8bae\u52a0\u4e00\u4e2a idx_shop(shop_id)&#xff0c;EXPLAIN \u53d8\u6210 type&#061;index, Extra: Using index&#xff0c;Using temporary \u6ca1\u4e86&#xff0c;\u8017\u65f6\u964d\u5230 0.37 \u79d2\u3002\u5230\u8fd9\u91cc\u4e00\u5207\u6b63\u5e38\u3002<\/p>\n<p>\u7136\u540e\u628a COUNT(*) \u6362\u6210 SUM(amount)&#xff0c;\u540c\u6837\u7684\u7d22\u5f15&#xff1a;<\/p>\n<table>\n<tr>\u5199\u6cd5EXPLAIN Extra\u8017\u65f6<\/tr>\n<tbody>\n<tr>\n<td>\u4e0d\u8d70\u7d22\u5f15&#xff08;IGNORE INDEX(idx_shop)&#xff09;<\/td>\n<td>Using temporary<\/td>\n<td>1.12 \u79d2<\/td>\n<\/tr>\n<tr>\n<td>\u8d70 idx_shop(shop_id)<\/td>\n<td>&#xff08;\u7a7a&#xff09;<\/td>\n<td>6.87&#xff5e;6.99 \u79d2<\/td>\n<\/tr>\n<tr>\n<td>\u8d70 idx_shop_amount(shop_id, amount)<\/td>\n<td>Using index<\/td>\n<td>0.54 \u79d2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u52a0\u4e86\u7d22\u5f15\u6162\u4e86 6 \u500d\u3002\u539f\u56e0\u662f amount \u4e0d\u5728 idx_shop \u91cc&#xff1a;MySQL \u6309\u7d22\u5f15\u987a\u5e8f\u626b 400 \u4e07\u4e2a shop_id&#xff0c;\u6bcf\u62ff\u5230\u4e00\u4e2a\u5c31\u8981\u56de\u4e3b\u952e\u7d22\u5f15\u53d6\u4e00\u6b21 amount&#xff0c;400 \u4e07\u6b21\u968f\u673a\u8bfb\u3002\u5168\u8868\u626b\u63cf\u53cd\u800c\u662f\u987a\u5e8f\u8bfb&#xff0c;\u518d\u52a0\u4e00\u5f20 2000 \u884c\u7684\u5185\u5b58\u4e34\u65f6\u8868&#xff0c;\u4fbf\u5b9c\u5f97\u591a\u3002<\/p>\n<p>\u4f18\u5316\u5668\u4e3a\u4ec0\u4e48\u4f1a\u9009\u8fd9\u4e2a\u6162\u7684\u65b9\u6848&#xff1f;\u4ece\u7ed3\u679c\u770b&#xff0c;\u5b83\u4f4e\u4f30\u4e86\u56de\u8868\u7684\u4ee3\u4ef7&#xff0c;\u5b81\u53ef\u56de\u8868\u4e5f\u8981\u7701\u6389\u4e34\u65f6\u8868&#xff08;\u6211\u6ca1\u53bb\u7ffb optimizer trace \u7684\u6210\u672c\u6570\u5b57&#xff0c;\u8fd9\u91cc\u53ea\u8bf4\u73b0\u8c61&#xff09;\u3002EXPLAIN \u91cc Extra \u4e00\u680f\u662f\u7a7a\u7684&#xff0c;\u770b\u8d77\u6765\u6bd4 Using temporary \u5e72\u51c0&#xff0c;\u5b9e\u9645\u662f\u6700\u6162\u7684\u90a3\u4e2a\u3002<\/p>\n<p>\u6539\u6cd5&#xff1a;\u628a\u805a\u5408\u8981\u7528\u7684\u5217\u4e5f\u653e\u8fdb\u7d22\u5f15&#xff0c;\u505a\u6210\u8986\u76d6\u7d22\u5f15&#xff08;EXPLAIN \u51fa\u73b0 Using index&#xff09;\u3002(shop_id, amount) \u4e4b\u540e 0.54 \u79d2&#xff0c;\u6bd4\u5168\u8868\u626b\u63cf\u5feb\u4e00\u500d\u3002<\/p>\n<p>\u26a0\ufe0f \u5224\u65ad\u4e00\u4e2a GROUP BY \u7684\u7d22\u5f15\u597d\u4e0d\u597d&#xff0c;\u4e0d\u8981\u53ea\u770b Using temporary \u6709\u6ca1\u6709\u6d88\u6389&#xff0c;\u8981\u770b\u6709\u6ca1\u6709 Using index\u3002Extra \u4e3a\u7a7a\u3001type \u662f index \u7684&#xff0c;\u5927\u6982\u7387\u5728\u56de\u8868\u3002<\/p>\n<hr \/>\n<h3>\u56db\u3001\u5751\u4e8c&#xff1a;\u5e26\u65f6\u95f4\u8303\u56f4\u7684\u7edf\u8ba1&#xff0c;\u7d22\u5f15\u987a\u5e8f\u53cd\u4e86<\/h3>\n<p>\u62a5\u8868\u51e0\u4e4e\u90fd\u5e26\u65f6\u95f4\u6761\u4ef6&#xff0c;\u6bd4\u5982&#034;\u672c\u6708\u4ee5\u6765\u6bcf\u4e2a\u5e97\u94fa\u7684\u9500\u552e\u989d&#034;&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> shop_id<span class=\"token punctuation\">,<\/span> <span class=\"token function\">SUM<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">FROM<\/span> orders<br \/>\n<span class=\"token keyword\">WHERE<\/span> created_at <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token string\">&#039;2026-10-01&#039;<\/span><br \/>\n<span class=\"token keyword\">GROUP<\/span> <span class=\"token keyword\">BY<\/span> shop_id<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7b26\u5408\u6761\u4ef6\u7684\u6709 40.6 \u4e07\u884c&#xff0c;\u5360\u5168\u8868\u4e00\u6210\u3002\u6211\u4f9d\u6b21\u52a0\u4e86\u51e0\u4e2a\u7d22\u5f15&#xff0c;\u8bb0\u5f55\u4f18\u5316\u5668\u6bcf\u6b21\u7684\u9009\u62e9&#xff1a;<\/p>\n<table>\n<tr>\u5f53\u65f6\u8868\u4e0a\u6709\u7684\u7d22\u5f15\u4f18\u5316\u5668\u9009\u7684Extra\u8017\u65f6<\/tr>\n<tbody>\n<tr>\n<td>\u6ca1\u6709\u7d22\u5f15<\/td>\n<td>\u5168\u8868\u626b\u63cf<\/td>\n<td>Using where; Using temporary<\/td>\n<td>0.63 \u79d2<\/td>\n<\/tr>\n<tr>\n<td>(shop_id, amount)<\/td>\n<td>(shop_id, amount)<\/td>\n<td>Using where<\/td>\n<td>6.54&#xff5e;6.90 \u79d2<\/td>\n<\/tr>\n<tr>\n<td>\u518d\u52a0 (created_at)<\/td>\n<td>(created_at)<\/td>\n<td>Using index condition; Using temporary<\/td>\n<td>0.80 \u79d2<\/td>\n<\/tr>\n<tr>\n<td>\u518d\u52a0 (created_at, shop_id, amount)<\/td>\n<td>\u8fd9\u4e2a<\/td>\n<td>Using where; Using index; Using temporary<\/td>\n<td>0.13 \u79d2<\/td>\n<\/tr>\n<tr>\n<td>\u5f3a\u5236\u7528 (shop_id, created_at, amount)<\/td>\n<td>\u8fd9\u4e2a<\/td>\n<td>Using where; Using index<\/td>\n<td>0.54 \u79d2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u51e0\u4e2a\u7ed3\u8bba&#xff1a;<\/p>\n<li>\u7b2c\u4e8c\u884c\u53c8\u662f\u5751\u4e00&#xff1a;\u4f18\u5316\u5668\u4e3a\u4e86\u6309 shop_id \u987a\u5e8f\u5206\u7ec4&#xff0c;\u9009\u4e86\u4e0d\u542b created_at \u7684\u7d22\u5f15&#xff0c;\u6bcf\u884c\u56de\u8868\u5224\u65ad\u65f6\u95f4&#xff0c;6.9 \u79d2<\/li>\n<li>\u53ea\u6709 created_at \u5355\u5217\u7d22\u5f15\u65f6&#xff0c;\u6bd4\u5168\u8868\u626b\u63cf\u8fd8\u6162&#xff1a;\u8303\u56f4\u626b\u51fa 40 \u4e07\u884c&#xff0c;\u6bcf\u884c\u56de\u8868\u53d6 shop_id \u548c amount&#xff0c;0.80 \u79d2&#xff0c;\u5168\u8868\u626b\u63cf 0.63 \u79d2<\/li>\n<li>\u6700\u5feb\u7684\u662f\u8303\u56f4\u6761\u4ef6\u5217\u653e\u7b2c\u4e00\u4f4d\u3001\u5206\u7ec4\u5217\u548c\u805a\u5408\u5217\u8ddf\u5728\u540e\u9762&#xff1a;(created_at, shop_id, amount) \u53ea\u626b\u4e00\u6210\u7684\u7d22\u5f15&#xff0c;\u4e0d\u56de\u8868&#xff0c;\u867d\u7136\u8fd8\u6709 Using temporary&#xff0c;0.13 \u79d2<\/li>\n<li>(shop_id, created_at, amount) \u80fd\u6d88\u6389\u4e34\u65f6\u8868&#xff0c;\u4f46\u65f6\u95f4\u6761\u4ef6\u7528\u4e0d\u4e0a\u7d22\u5f15\u8303\u56f4&#xff0c;\u8981\u626b\u6574\u4e2a\u7d22\u5f15&#xff0c;0.54 \u79d2<\/li>\n<p>\u6240\u4ee5\u5e26\u8303\u56f4\u6761\u4ef6\u7684 GROUP BY&#xff0c;\u4e00\u822c\u4f18\u5148\u8ba9 WHERE \u7684\u8303\u56f4\u5148\u628a\u884c\u6570\u780d\u4e0b\u6765&#xff0c;\u4e34\u65f6\u8868\u7559\u7740\u6ca1\u5173\u7cfb&#xff0c;2000 \u4e2a\u5206\u7ec4\u7684\u4e34\u65f6\u8868\u5728\u5185\u5b58\u91cc\u5f88\u5feb\u3002\u4e24\u79cd\u987a\u5e8f\u7684\u7d22\u5f15\u90fd\u5efa\u4e0a\u65f6&#xff0c;\u4f18\u5316\u5668\u81ea\u5df1\u9009\u4e86\u5feb\u7684\u90a3\u4e2a\u3002<\/p>\n<hr \/>\n<h3>\u4e94\u3001\u5751\u4e09&#xff1a;\u5206\u7ec4\u6570\u5f88\u591a\u65f6&#xff0c;\u4e34\u65f6\u8868\u843d\u76d8<\/h3>\n<p>\u6309\u5e97\u94fa\u5206\u7ec4\u53ea\u6709 2000 \u7ec4\u3002\u6362\u6210\u6309\u7528\u6237\u5206\u7ec4&#xff0c;\u6709 49.6 \u4e07\u7ec4&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> <span class=\"token function\">COUNT<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">FROM<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n  <span class=\"token keyword\">SELECT<\/span> user_id<span class=\"token punctuation\">,<\/span> <span class=\"token function\">COUNT<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span> c <span class=\"token keyword\">FROM<\/span> orders <span class=\"token keyword\">GROUP<\/span> <span class=\"token keyword\">BY<\/span> user_id<br \/>\n<span class=\"token punctuation\">)<\/span> x<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5916\u9762\u5305\u4e00\u5c42 COUNT \u662f\u4e3a\u4e86\u4e0d\u628a 49.6 \u4e07\u884c\u7ed3\u679c\u4f20\u7ed9\u5ba2\u6237\u7aef&#xff0c;\u53ea\u6d4b\u5206\u7ec4\u672c\u8eab\u3002\u6ca1\u6709 user_id \u7d22\u5f15\u65f6\u8017\u65f6 7.75 \u79d2&#xff0c;\u6267\u884c\u540e\u770b\u72b6\u6001&#xff1a;<\/p>\n<p><span class=\"token keyword\">SHOW<\/span> <span class=\"token keyword\">SESSION<\/span> <span class=\"token keyword\">STATUS<\/span> <span class=\"token operator\">LIKE<\/span> <span class=\"token string\">&#039;Created_tmp_disk_tables&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">&#8212; Created_tmp_disk_tables &#061; 1<\/span><\/p>\n<p>\u4e34\u65f6\u8868\u8d85\u8fc7\u4e86\u5185\u5b58\u4e0a\u9650&#xff0c;\u8f6c\u5230\u4e86\u78c1\u76d8\u4e0a\u3002MySQL 8 \u7684\u5185\u90e8\u4e34\u65f6\u8868\u9ed8\u8ba4\u7528 TempTable \u5f15\u64ce&#xff0c;\u6309\u5b98\u65b9\u6587\u6863&#xff0c;\u4ece 8.0.28 \u8d77\u5355\u5f20\u5185\u5b58\u4e34\u65f6\u8868\u7684\u4e0a\u9650\u7531 tmp_table_size \u63a7\u5236&#xff0c;\u9ed8\u8ba4 16 MB&#xff0c;\u8d85\u8fc7\u540e\u81ea\u52a8\u8f6c\u6210 InnoDB \u78c1\u76d8\u4e34\u65f6\u8868\u3002\u6211\u5728\u4f1a\u8bdd\u91cc\u8c03\u5927\u5b83\u518d\u8dd1&#xff1a;<\/p>\n<table>\n<tr>tmp_table_sizeCreated_tmp_disk_tables\u8017\u65f6<\/tr>\n<tbody>\n<tr>\n<td>16 MB&#xff08;\u9ed8\u8ba4&#xff09;<\/td>\n<td>1<\/td>\n<td>7.75 \u79d2<\/td>\n<\/tr>\n<tr>\n<td>64 MB<\/td>\n<td>0<\/td>\n<td>2.63 \u79d2<\/td>\n<\/tr>\n<tr>\n<td>256 MB<\/td>\n<td>0<\/td>\n<td>3.01 \u79d2<\/td>\n<\/tr>\n<tr>\n<td>\u9ed8\u8ba4\u503c &#043; \u52a0 idx_user(user_id) \u7d22\u5f15<\/td>\n<td>0<\/td>\n<td>0.45 \u79d2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8c03\u5927 tmp_table_size \u8ba9\u4e34\u65f6\u8868\u7559\u5728\u5185\u5b58&#xff0c;\u5feb\u4e86\u5c06\u8fd1 3 \u500d&#xff0c;\u518d\u5f80\u4e0a\u8c03\u6ca1\u6709\u6536\u76ca\u3002\u4f46\u6700\u6709\u6548\u7684\u8fd8\u662f\u52a0\u7d22\u5f15&#xff0c;\u6309\u7d22\u5f15\u987a\u5e8f\u5206\u7ec4\u6839\u672c\u4e0d\u9700\u8981\u4e34\u65f6\u8868\u3002<\/p>\n<p>tmp_table_size \u662f\u6bcf\u4e2a\u67e5\u8be2\u6bcf\u5f20\u4e34\u65f6\u8868\u7684\u4e0a\u9650&#xff0c;\u5168\u5c40\u8c03\u5927\u4ee5\u540e&#xff0c;\u5e76\u53d1\u7684\u5927\u5206\u7ec4\u67e5\u8be2\u4f1a\u4e00\u8d77\u5403\u5185\u5b58\u3002\u6211\u7684\u5efa\u8bae\u662f\u53ea\u5728\u8dd1\u62a5\u8868\u7684\u4f1a\u8bdd\u91cc SET SESSION&#xff0c;\u4e0d\u8981\u968f\u624b\u6539\u5168\u5c40\u3002<\/p>\n<p>\u672c\u673a 8.2.0 \u7684\u76f8\u5173\u9ed8\u8ba4\u503c&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> &#064;<span class=\"token variable\">&#064;tmp_table_size<\/span><span class=\"token punctuation\">,<\/span> &#064;<span class=\"token variable\">&#064;temptable_max_ram<\/span><span class=\"token punctuation\">,<\/span> &#064;<span class=\"token variable\">&#064;internal_tmp_mem_storage_engine<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">&#8212; 16777216   1073741824   TempTable<\/span><\/p>\n<hr \/>\n<h3>\u516d\u3001\u80fd\u5feb 700 \u500d\u7684\u573a\u666f&#xff1a;\u6bcf\u7ec4\u53d6\u6700\u5927\u503c<\/h3>\n<p>&#034;\u6bcf\u4e2a\u5e97\u94fa\u6700\u540e\u4e00\u7b14\u8ba2\u5355\u7684\u65f6\u95f4&#034;\u8fd9\u7c7b\u67e5\u8be2&#xff0c;\u6709\u4e00\u4e2a\u7279\u522b\u7684\u6267\u884c\u65b9\u5f0f&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> shop_id<span class=\"token punctuation\">,<\/span> <span class=\"token function\">MAX<\/span><span class=\"token punctuation\">(<\/span>created_at<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">FROM<\/span> orders <span class=\"token keyword\">GROUP<\/span> <span class=\"token keyword\">BY<\/span> shop_id<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6709 (shop_id, created_at, &#8230;) \u8fd9\u6837\u7684\u7d22\u5f15\u65f6&#xff0c;EXPLAIN \u663e\u793a&#xff1a;<\/p>\n<p>type&#061;range  key&#061;idx_shop_created_amount  rows&#061;2002  Extra: Using index for group-by<\/p>\n<p>Using index for group-by \u5c31\u662f\u677e\u6563\u7d22\u5f15\u626b\u63cf&#xff1a;\u6bcf\u4e2a\u5e97\u94fa\u53ea\u9700\u8981\u8df3\u5230\u7d22\u5f15\u91cc\u8fd9\u4e00\u7ec4\u7684\u6700\u540e\u4e00\u6761&#xff0c;2000 \u4e2a\u5e97\u94fa\u8bfb 2000 \u6b21\u5de6\u53f3&#xff0c;\u4e0d\u7528\u626b 400 \u4e07\u884c\u3002\u8017\u65f6 0.01 \u79d2\u3002\u628a\u8fd9\u4e2a\u7d22\u5f15\u5ffd\u7565\u6389&#xff0c;\u4f18\u5316\u5668\u9000\u56de (shop_id, amount) \u52a0\u56de\u8868&#xff0c;7 \u79d2\u5de6\u53f3\u3002<\/p>\n<p>\u9002\u7528\u6761\u4ef6\u6bd4\u8f83\u82db\u523b&#xff08;\u636e\u5b98\u65b9\u6587\u6863 GROUP BY Optimization \u4e00\u8282&#xff09;&#xff1a;\u53ea\u67e5\u4e00\u5f20\u8868&#xff1b;GROUP BY \u7684\u5217\u662f\u7d22\u5f15\u7684\u6700\u5de6\u524d\u7f00&#xff1b;\u805a\u5408\u51fd\u6570\u53ea\u80fd\u662f MIN \/ MAX&#xff0c;\u6216\u8005 COUNT(DISTINCT)\u3001SUM(DISTINCT) \u8fd9\u7c7b\u53bb\u91cd\u805a\u5408\u3002\u666e\u901a\u7684 COUNT(*)\u3001SUM \u7528\u4e0d\u4e0a\u3002<\/p>\n<hr \/>\n<h3>\u4e03\u3001\u6392\u884c\u699c\u7c7b\u67e5\u8be2&#xff1a;\u52a0\u7d22\u5f15\u4e0d\u591f\u5c31\u4e0a\u6c47\u603b\u8868<\/h3>\n<p>&#034;\u9500\u91cf\u524d 10 \u7684\u5e97\u94fa&#034;\u8981\u6309 COUNT \u6392\u5e8f\u53d6\u524d\u51e0\u540d&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> shop_id<span class=\"token punctuation\">,<\/span> <span class=\"token function\">COUNT<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span> c <span class=\"token keyword\">FROM<\/span> orders<br \/>\n<span class=\"token keyword\">GROUP<\/span> <span class=\"token keyword\">BY<\/span> shop_id <span class=\"token keyword\">ORDER<\/span> <span class=\"token keyword\">BY<\/span> c <span class=\"token keyword\">DESC<\/span> <span class=\"token keyword\">LIMIT<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>LIMIT 10 \u5e2e\u4e0d\u4e0a\u5206\u7ec4\u7684\u5fd9&#xff0c;\u4e0d\u628a\u6bcf\u4e2a\u5e97\u94fa\u90fd\u6570\u5b8c&#xff0c;\u8c01\u4e5f\u4e0d\u77e5\u9053\u524d 10 \u662f\u8c01\u3002EXPLAIN \u91cc Using temporary; Using filesort \u5fc5\u7136\u5b58\u5728&#xff1a;\u6ca1\u6709\u7d22\u5f15 0.83 \u79d2&#xff0c;\u7528\u8986\u76d6\u7d22\u5f15 0.37 \u79d2&#xff0c;\u518d\u5f80\u4e0b\u5c31\u538b\u4e0d\u52a8\u4e86\u3002<\/p>\n<p>\u8fd9\u7c7b\u67e5\u8be2\u5982\u679c\u5728\u9996\u9875\u3001\u6bcf\u6b21\u5237\u65b0\u90fd\u8dd1&#xff0c;\u5e38\u89c1\u505a\u6cd5\u662f\u6309\u5929\u9884\u805a\u5408&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; \u6bcf\u4e2a\u5e97\u94fa\u6bcf\u5929\u4e00\u884c<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">TABLE<\/span> shop_daily_stats <span class=\"token punctuation\">(<\/span><br \/>\n  shop_id <span class=\"token keyword\">INT<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  stat_date <span class=\"token keyword\">DATE<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  order_cnt <span class=\"token keyword\">INT<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  order_amount <span class=\"token keyword\">DECIMAL<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">14<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n  <span class=\"token keyword\">PRIMARY<\/span> <span class=\"token keyword\">KEY<\/span> <span class=\"token punctuation\">(<\/span>stat_date<span class=\"token punctuation\">,<\/span> shop_id<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">ENGINE<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token keyword\">InnoDB<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e00\u5e74\u7684\u6570\u636e\u6c47\u603b\u4e0b\u6765 72.7 \u4e07\u884c&#xff08;\u7b2c\u4e00\u6b21\u5168\u91cf\u751f\u6210\u7528\u4e86 11 \u79d2&#xff09;\u3002\u5bf9\u6bd4\u540c\u6837\u7684\u6392\u884c\u699c&#xff1a;<\/p>\n<table>\n<tr>\u67e5\u8be2\u8303\u56f4\u76f4\u63a5\u67e5 orders\u67e5 shop_daily_stats<\/tr>\n<tbody>\n<tr>\n<td>\u6700\u8fd1 30 \u5929 TOP 10<\/td>\n<td>0.08 \u79d2<\/td>\n<td>0.02 \u79d2<\/td>\n<\/tr>\n<tr>\n<td>\u5168\u5e74 TOP 10<\/td>\n<td>0.38 \u79d2<\/td>\n<td>0.19 \u79d2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e24\u8fb9\u67e5\u51fa\u6765\u7684\u524d\u4e09\u540d\u4e00\u81f4&#xff08;537\u30011377\u3001873&#xff09;\u3002\u6c47\u603b\u8868\u7684\u6536\u76ca\u968f\u539f\u8868\u884c\u6570\u589e\u957f&#xff1a;\u8ba2\u5355\u8868\u6da8\u5230\u51e0\u5343\u4e07&#xff0c;\u76f4\u63a5\u67e5\u4f1a\u7ebf\u6027\u53d8\u6162&#xff0c;\u6c47\u603b\u8868\u53ea\u968f&#034;\u5e97\u94fa\u6570 \u00d7 \u5929\u6570&#034;\u589e\u957f\u3002<\/p>\n<p>\u6bcf\u5929\u7684\u589e\u91cf\u7528\u5b9a\u65f6\u4efb\u52a1\u91cd\u7b97\u5f53\u5929&#xff0c;\u7528 ON DUPLICATE KEY UPDATE \u8986\u76d6\u3002\u6ce8\u610f MySQL 8 \u91cc VALUES(col) \u5199\u6cd5\u4f1a\u62a5\u8b66\u544a&#xff1a;<\/p>\n<p>Warning 1287 &#039;VALUES function&#039; is deprecated and will be removed in a future release.<br \/>\nPlease use an alias (INSERT INTO &#8230; VALUES (&#8230;) AS alias) and replace VALUES(col)<br \/>\nin the ON DUPLICATE KEY UPDATE clause with alias.col instead<\/p>\n<p>INSERT &#8230; SELECT \u7684\u573a\u666f&#xff0c;\u628a SELECT \u5305\u6210\u6d3e\u751f\u8868&#xff0c;\u7528\u522b\u540d\u5f15\u7528&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; \u91cd\u7b97 2026-11-06 \u5f53\u5929&#xff0c;\u5df2\u5b58\u5728\u7684\u884c\u8986\u76d6<\/span><br \/>\n<span class=\"token keyword\">INSERT<\/span> <span class=\"token keyword\">INTO<\/span> shop_daily_stats<br \/>\n<span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">FROM<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n  <span class=\"token keyword\">SELECT<\/span> shop_id<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">DATE<\/span><span class=\"token punctuation\">(<\/span>created_at<span class=\"token punctuation\">)<\/span> d<span class=\"token punctuation\">,<\/span> <span class=\"token function\">COUNT<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span> cnt<span class=\"token punctuation\">,<\/span> <span class=\"token function\">SUM<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span> amt<br \/>\n  <span class=\"token keyword\">FROM<\/span> orders<br \/>\n  <span class=\"token keyword\">WHERE<\/span> created_at <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token string\">&#039;2026-11-06&#039;<\/span> <span class=\"token operator\">AND<\/span> created_at <span class=\"token operator\">&lt;<\/span> <span class=\"token string\">&#039;2026-11-07&#039;<\/span><br \/>\n  <span class=\"token keyword\">GROUP<\/span> <span class=\"token keyword\">BY<\/span> shop_id<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">DATE<\/span><span class=\"token punctuation\">(<\/span>created_at<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">AS<\/span> s<br \/>\n<span class=\"token keyword\">ON<\/span> <span class=\"token keyword\">DUPLICATE<\/span> <span class=\"token keyword\">KEY<\/span> <span class=\"token keyword\">UPDATE<\/span> order_cnt <span class=\"token operator\">&#061;<\/span> s<span class=\"token punctuation\">.<\/span>cnt<span class=\"token punctuation\">,<\/span> order_amount <span class=\"token operator\">&#061;<\/span> s<span class=\"token punctuation\">.<\/span>amt<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6211\u628a\u5176\u4e2d\u4e00\u884c\u7684 order_cnt \u5148\u6539\u6210 0 \u518d\u8dd1\u8fd9\u53e5&#xff0c;\u8dd1\u5b8c\u6062\u590d\u6210\u4e86 4&#xff0c;\u6ca1\u6709\u8b66\u544a\u3002<\/p>\n<p>\u6c47\u603b\u8868\u7684\u4ee3\u4ef7\u662f\u6570\u636e\u6709\u5ef6\u8fdf\u3001\u591a\u4e00\u4e2a\u5b9a\u65f6\u4efb\u52a1\u8981\u7ef4\u62a4&#xff0c;\u8ba2\u5355\u9000\u6b3e\u3001\u6539\u91d1\u989d\u8fd9\u7c7b\u4fee\u6539\u8981\u80fd\u89e6\u53d1\u91cd\u7b97\u3002\u53ea\u662f\u540e\u53f0\u5076\u5c14\u770b\u4e00\u773c\u7684\u62a5\u8868&#xff0c;\u4e0d\u503c\u5f97\u4e0a\u3002<\/p>\n<hr \/>\n<h3>\u516b\u3001\u4e24\u4e2a MySQL 8 \u7684\u884c\u4e3a\u53d8\u5316<\/h3>\n<p>GROUP BY \u4e0d\u518d\u9690\u5f0f\u6392\u5e8f\u3002\u5b98\u65b9\u6587\u6863\u7684\u8bf4\u6cd5\u662f&#xff0c;5.7 \u53ca\u4ee5\u524d GROUP BY \u5728\u67d0\u4e9b\u6761\u4ef6\u4e0b\u4f1a\u9690\u5f0f\u6392\u5e8f&#xff0c;8.0 \u8d77\u4e0d\u518d\u8fd9\u6837\u3002\u5b9e\u6d4b&#xff1a;<\/p>\n<p><span class=\"token keyword\">SELECT<\/span> <span class=\"token keyword\">status<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">COUNT<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">FROM<\/span> orders <span class=\"token keyword\">GROUP<\/span> <span class=\"token keyword\">BY<\/span> <span class=\"token keyword\">status<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">&#8212; \u8f93\u51fa\u987a\u5e8f&#xff1a;3, 5, 4, 2, 1<\/span><\/p>\n<p>\u8001\u4ee3\u7801\u4f9d\u8d56&#034;GROUP BY \u51fa\u6765\u5c31\u662f\u6709\u5e8f\u7684&#034;&#xff0c;\u5347\u7ea7 8.0 \u4ee5\u540e\u5217\u8868\u987a\u5e8f\u4f1a\u4e71&#xff0c;\u8981\u663e\u5f0f\u52a0 ORDER BY\u3002\u4ee5\u524d\u4e3a\u4e86\u53bb\u6389\u6392\u5e8f\u5199\u7684 ORDER BY NULL&#xff0c;\u5b98\u65b9\u6587\u6863\u8bf4 8.0 \u91cc\u5df2\u7ecf\u4e0d\u9700\u8981\u4e86&#xff0c;\u7559\u7740\u4e5f\u4e0d\u5f71\u54cd\u7ed3\u679c\u3002<\/p>\n<p>ONLY_FULL_GROUP_BY \u9ed8\u8ba4\u5f00\u542f\u3002SELECT \u91cc\u51fa\u73b0\u4e86\u65e2\u4e0d\u5728 GROUP BY \u91cc\u3001\u4e5f\u6ca1\u6709\u88ab\u805a\u5408\u7684\u5217&#xff0c;\u76f4\u63a5\u62a5\u9519&#xff1a;<\/p>\n<p>ERROR 1055 (42000): Expression #2 of SELECT list is not in GROUP BY clause and contains<br \/>\nnonaggregated column &#039;t.orders.user_id&#039; which is not functionally dependent on columns<br \/>\nin GROUP BY clause; this is incompatible with sql_mode&#061;only_full_group_by<\/p>\n<p>\u6309\u5e97\u94fa\u5206\u7ec4&#xff0c;\u4e00\u4e2a\u5e97\u94fa\u6709\u5f88\u591a\u4e2a user_id&#xff0c;5.7 \u5bbd\u677e\u6a21\u5f0f\u4e0b\u4f1a\u968f\u4fbf\u8fd4\u56de\u5176\u4e2d\u4e00\u4e2a&#xff0c;\u7ed3\u679c\u4e0d\u786e\u5b9a\u3002\u6b63\u786e\u6539\u6cd5\u662f\u60f3\u6e05\u695a\u8981\u54ea\u4e2a&#xff1a;\u8981\u4efb\u610f\u4e00\u4e2a\u5c31 ANY_VALUE(user_id)&#xff0c;\u8981\u6700\u5927\u7684\u5c31 MAX(user_id)&#xff0c;\u8981\u6bcf\u4e2a\u90fd\u770b\u5c31\u628a\u5b83\u52a0\u8fdb GROUP BY\u3002\u4e0d\u5efa\u8bae\u628a sql_mode \u91cc\u7684 ONLY_FULL_GROUP_BY \u53bb\u6389\u4e86\u4e8b\u3002<\/p>\n<hr \/>\n<h3>\u4e5d\u3001\u901f\u67e5\u8868<\/h3>\n<table>\n<tr>\u73b0\u8c61\u539f\u56e0\u6539\u6cd5<\/tr>\n<tbody>\n<tr>\n<td>type&#061;ALL&#xff0c;Using temporary&#xff0c;\u5206\u7ec4\u6570\u5c11<\/td>\n<td>\u5168\u8868\u626b\u63cf &#043; \u5185\u5b58\u4e34\u65f6\u8868<\/td>\n<td>\u4e0d\u4e00\u5b9a\u8981\u6539&#xff1b;\u8981\u6539\u5c31\u5efa\u8986\u76d6\u7d22\u5f15<\/td>\n<\/tr>\n<tr>\n<td>type&#061;index&#xff0c;Extra \u4e3a\u7a7a&#xff0c;\u6bd4\u5168\u8868\u626b\u63cf\u8fd8\u6162<\/td>\n<td>\u8d70\u5206\u7ec4\u5217\u7d22\u5f15&#xff0c;\u6bcf\u884c\u56de\u8868<\/td>\n<td>\u628a\u805a\u5408\u5217\u52a0\u8fdb\u7d22\u5f15&#xff0c;\u770b\u5230 Using index<\/td>\n<\/tr>\n<tr>\n<td>\u5e26\u8303\u56f4 WHERE&#xff0c;\u8d70\u4e86\u5206\u7ec4\u5217\u5f00\u5934\u7684\u7d22\u5f15&#xff0c;\u5f88\u6162<\/td>\n<td>\u8303\u56f4\u6761\u4ef6\u7528\u4e0d\u4e0a&#xff0c;\u626b\u5168\u7d22\u5f15 &#043; \u56de\u8868<\/td>\n<td>\u5efa (\u8303\u56f4\u5217, \u5206\u7ec4\u5217, \u805a\u5408\u5217)<\/td>\n<\/tr>\n<tr>\n<td>\u5206\u7ec4\u6570\u5f88\u591a&#xff0c;Created_tmp_disk_tables \u589e\u52a0<\/td>\n<td>\u4e34\u65f6\u8868\u8d85\u8fc7 tmp_table_size<\/td>\n<td>\u7ed9\u5206\u7ec4\u5217\u5efa\u7d22\u5f15&#xff1b;\u6216\u62a5\u8868\u4f1a\u8bdd\u91cc SET SESSION \u8c03\u5927<\/td>\n<\/tr>\n<tr>\n<td>\u6bcf\u7ec4\u53d6 MIN\/MAX<\/td>\n<td>\u2014<\/td>\n<td>\u7d22\u5f15 (\u5206\u7ec4\u5217, MIN\/MAX \u5217)&#xff0c;\u770b\u5230 Using index for group-by<\/td>\n<\/tr>\n<tr>\n<td>ORDER BY COUNT(*) DESC LIMIT N<\/td>\n<td>\u5fc5\u987b\u7b97\u5b8c\u6240\u6709\u7ec4<\/td>\n<td>\u8986\u76d6\u7d22\u5f15&#xff1b;\u8fd8\u4e0d\u591f\u5c31\u6309\u5929\u6c47\u603b\u8868<\/td>\n<\/tr>\n<tr>\n<td>\u5347\u7ea7 8.0 \u540e\u5217\u8868\u987a\u5e8f\u4e71\u4e86<\/td>\n<td>GROUP BY \u4e0d\u518d\u9690\u5f0f\u6392\u5e8f<\/td>\n<td>\u663e\u5f0f\u5199 ORDER BY<\/td>\n<\/tr>\n<tr>\n<td>ERROR 1055<\/td>\n<td>ONLY_FULL_GROUP_BY<\/td>\n<td>ANY_VALUE \/ \u805a\u5408 \/ \u52a0\u8fdb GROUP BY<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>\u5e38\u89c1\u95ee\u9898<\/h3>\n<p>Q&#xff1a;Using temporary \u4e00\u5b9a\u8981\u6d88\u6389\u5417&#xff1f;<\/p>\n<p>\u4e0d\u7528\u3002\u672c\u6587 2000 \u4e2a\u5206\u7ec4\u7684\u5185\u5b58\u4e34\u65f6\u8868\u5f00\u9500\u5f88\u5c0f&#xff0c;\u6700\u5feb\u7684\u90a3\u4e2a\u65b9\u6848&#xff08;0.13 \u79d2&#xff09;\u4e5f\u5e26\u7740 Using temporary\u3002\u8981\u8b66\u60d5\u7684\u662f\u4e34\u65f6\u8868\u843d\u76d8&#xff08;\u770b Created_tmp_disk_tables&#xff09;\u548c\u4e3a\u4e86\u6d88\u6389\u5b83\u800c\u5f15\u5165\u7684\u56de\u8868\u3002<\/p>\n<p>Q&#xff1a;\u4f18\u5316\u5668\u9009\u9519\u7d22\u5f15\u4e86\u600e\u4e48\u529e&#xff1f;<\/p>\n<p>\u5148\u786e\u8ba4\u4e24\u4e2a\u7d22\u5f15\u90fd\u5efa\u4e86&#xff0c;\u672c\u6587\u7b2c\u56db\u8282\u4e24\u79cd\u987a\u5e8f\u7684\u7d22\u5f15\u90fd\u5728\u65f6&#xff0c;\u4f18\u5316\u5668\u9009\u5bf9\u4e86\u3002\u5b9e\u5728\u9009\u9519&#xff0c;\u53ef\u4ee5\u7528 FORCE INDEX&#xff0c;\u4f46\u5b83\u4f1a\u628a\u6267\u884c\u8ba1\u5212\u5199\u6b7b&#xff0c;\u6570\u636e\u5206\u5e03\u53d8\u4e86\u4e0d\u4f1a\u8ddf\u7740\u8c03\u6574&#xff0c;\u7528\u4e4b\u524d\u5728\u4ee3\u7801\u91cc\u7559\u4e2a\u6ce8\u91ca\u8bf4\u660e\u539f\u56e0\u3002<\/p>\n<p>Q&#xff1a;\u751f\u4ea7\u5e93\u6570\u636e\u4e0d\u5728\u5185\u5b58\u91cc&#xff0c;\u7ed3\u8bba\u8fd8\u6210\u7acb\u5417&#xff1f;<\/p>\n<p>\u65b9\u5411\u4e00\u6837&#xff0c;\u5dee\u8ddd\u4f1a\u66f4\u5927\u3002\u672c\u6587\u6570\u636e\u5168\u90e8\u5728 buffer pool \u91cc&#xff0c;\u56de\u8868\u53ea\u662f\u5185\u5b58\u91cc\u7684\u968f\u673a\u8bbf\u95ee\u5c31\u6162\u4e86 6 \u500d&#xff1b;\u6570\u636e\u8981\u4ece\u78c1\u76d8\u8bfb\u65f6&#xff0c;\u968f\u673a\u8bfb\u6bd4\u987a\u5e8f\u8bfb\u7684\u4ee3\u4ef7\u66f4\u9ad8\u3002\u5177\u4f53\u500d\u6570\u6211\u6ca1\u5728\u78c1\u76d8\u573a\u666f\u4e0b\u6d4b\u3002<\/p>\n<p>Q&#xff1a;\u7528 MySQL 5.7 \u6709\u533a\u522b\u5417&#xff1f;<\/p>\n<p>5.7 \u6ca1\u6709 TempTable \u5f15\u64ce&#xff0c;\u636e 5.7 \u6587\u6863&#xff0c;\u5185\u5b58\u4e34\u65f6\u8868\u7684\u4e0a\u9650\u662f tmp_table_size \u548c max_heap_table_size \u4e24\u8005\u4e2d\u8f83\u5c0f\u7684\u90a3\u4e2a&#xff0c;\u53ea\u8c03\u4e00\u4e2a\u4e0d\u4e00\u5b9a\u751f\u6548&#xff1b;GROUP BY \u5728\u67d0\u4e9b\u6761\u4ef6\u4e0b\u8fd8\u4f1a\u9690\u5f0f\u6392\u5e8f\u3002\u672c\u6587\u53ea\u5728 8.2.0 \u4e0a\u6d4b\u8fc7&#xff0c;5.7 \u7684\u6570\u5b57\u4e0d\u80fd\u76f4\u63a5\u5957\u7528\u3002<\/p>\n<hr \/>\n<h3>\u53c2\u8003\u94fe\u63a5<\/h3>\n<ul>\n<li>MySQL 8.0 GROUP BY \u4f18\u5316&#xff08;\u542b\u677e\u6563\u7d22\u5f15\u626b\u63cf\u6761\u4ef6&#xff09;&#xff1a;https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/group-by-optimization.html<\/li>\n<li>MySQL 8.0 \u5185\u90e8\u4e34\u65f6\u8868&#xff1a;https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/internal-temporary-tables.html<\/li>\n<li>MySQL 8.0 ONLY_FULL_GROUP_BY \u5904\u7406&#xff1a;https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/group-by-handling.html<\/li>\n<li>INSERT \u2026 ON DUPLICATE KEY UPDATE&#xff1a;https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/insert-on-duplicate.html<\/li>\n<\/ul>\n<hr \/>\n<p>\u4f60\u4eec\u9879\u76ee\u91cc\u6162\u7684 GROUP BY \u662f\u54ea\u4e00\u7c7b&#xff1a;\u5e26\u65f6\u95f4\u8303\u56f4\u7684\u62a5\u8868\u3001\u5206\u7ec4\u6570\u5f88\u591a\u7684\u6309\u7528\u6237\u7edf\u8ba1&#xff0c;\u8fd8\u662f\u9996\u9875\u6392\u884c\u699c&#xff1f;EXPLAIN \u91cc Extra \u662f\u4ec0\u4e48&#xff1f;\u8bc4\u8bba\u533a\u8d34\u51fa\u6765&#xff0c;\u6211\u6311\u5178\u578b\u7684\u8865\u8fdb FAQ\u3002<\/p>\n<p>\u89c9\u5f97\u6709\u7528\u7684\u8bdd\u70b9\u4e2a\u8d5e\u3001\u6536\u4e2a\u85cf&#xff0c;\u4e0b\u6b21\u6392\u67e5\u6162\u67e5\u8be2\u65f6\u7ffb\u5f97\u5230\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/#content_views .toc,\/* 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