{"id":191206,"date":"2024-11-12T16:29:17","date_gmt":"2024-11-12T08:29:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/191206\/"},"modified":"2024-11-12T16:29:19","modified_gmt":"2024-11-12T08:29:19","slug":"%e8%a9%b3%e8%a7%a3mysql%e5%88%86%e7%b5%84%e6%9f%a5%e8%a9%a2group-by%e5%af%a6%e7%8f%be%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/191206\/","title":{"rendered":"\u8a73\u89e3MySQL\u5206\u7d44\u67e5\u8a62Group By\u5be6\u73fe\u539f\u7406"},"content":{"rendered":"<h1 id=\"%e8%a9%b3%e8%a7%a3mysql%e5%88%86%e7%b5%84%e6%9f%a5%e8%a9%a2group-by%e5%af%a6%e7%8f%be%e5%8e%9f%e7%90%86-dSNiXPAvQS\">\u8a73\u89e3MySQL\u5206\u7d44\u67e5\u8a62Group By\u5be6\u73fe\u539f\u7406<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u578b\u6578\u64da\u5eab\u7cfb\u7d71\u3002\u5176\u5f37\u5927\u7684\u67e5\u8a62\u529f\u80fd\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u9ad8\u6548\u5730\u5f9e\u5927\u91cf\u6578\u64da\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u5176\u4e2d\uff0c<code>GROUP BY<\/code>\u5b50\u53e5\u662f\u9032\u884c\u6578\u64da\u5206\u7d44\u67e5\u8a62\u7684\u91cd\u8981\u5de5\u5177\uff0c\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5176\u5be6\u73fe\u539f\u7406\u53ca\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afgroup-by-dSNiXPAvQS\">\u4ec0\u9ebc\u662fGROUP BY<\/h2>\n<p><code>GROUP BY<\/code>\u5b50\u53e5\u7528\u65bc\u5c07\u67e5\u8a62\u7d50\u679c\u4e2d\u7684\u6578\u64da\u884c\u6839\u64da\u4e00\u500b\u6216\u591a\u500b\u5217\u9032\u884c\u5206\u7d44\u3002\u9019\u6a23\uff0c\u5c0d\u65bc\u6bcf\u4e00\u7d44\u6578\u64da\uff0c\u53ef\u4ee5\u9032\u884c\u805a\u5408\u8a08\u7b97\uff0c\u5982\u8a08\u7b97\u7e3d\u548c\u3001\u5e73\u5747\u503c\u3001\u8a08\u6578\u7b49\u3002\u9019\u5728\u5206\u6790\u6578\u64da\u6642\u975e\u5e38\u6709\u7528\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u5c0d\u6578\u64da\u9032\u884c\u7d71\u8a08\u6642\u3002<\/p>\n<h2 id=\"group-by%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-dSNiXPAvQS\">GROUP BY\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u4f7f\u7528<code>GROUP BY<\/code>\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT column1, aggregate_function(column2)\nFROM table_name\nWHERE condition\nGROUP BY column1;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>aggregate_function<\/code>\u53ef\u4ee5\u662f\u5982<code>SUM()<\/code>\u3001<code>AVG()<\/code>\u3001<code>COUNT()<\/code>\u7b49\u805a\u5408\u51fd\u6578\u3002<\/p>\n<h2 id=\"group-by%e7%9a%84%e5%af%a6%e7%8f%be%e5%8e%9f%e7%90%86-dSNiXPAvQS\">GROUP BY\u7684\u5be6\u73fe\u539f\u7406<\/h2>\n<p>\u7576\u57f7\u884c\u4e00\u500b\u5305\u542b<code>GROUP BY<\/code>\u7684\u67e5\u8a62\u6642\uff0cMySQL\u7684\u8655\u7406\u904e\u7a0b\u5927\u81f4\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li><strong>\u89e3\u6790\u67e5\u8a62\uff1a<\/strong>MySQL\u9996\u5148\u89e3\u6790SQL\u8a9e\u53e5\uff0c\u78ba\u5b9a\u9700\u8981\u67e5\u8a62\u7684\u8868\u548c\u5217\u3002<\/li>\n<li><strong>\u904e\u6ffe\u6578\u64da\uff1a<\/strong>\u6839\u64da<code>WHERE<\/code>\u5b50\u53e5\u7684\u689d\u4ef6\u904e\u6ffe\u6578\u64da\uff0c\u50c5\u4fdd\u7559\u7b26\u5408\u689d\u4ef6\u7684\u884c\u3002<\/li>\n<li><strong>\u5206\u7d44\u6578\u64da\uff1a<\/strong>\u5c07\u904e\u6ffe\u5f8c\u7684\u6578\u64da\u6839\u64da<code>GROUP BY<\/code>\u6307\u5b9a\u7684\u5217\u9032\u884c\u5206\u7d44\u3002<\/li>\n<li><strong>\u8a08\u7b97\u805a\u5408\uff1a<\/strong>\u5c0d\u6bcf\u4e00\u7d44\u6578\u64da\u61c9\u7528\u805a\u5408\u51fd\u6578\uff0c\u8a08\u7b97\u51fa\u6240\u9700\u7684\u7d71\u8a08\u503c\u3002<\/li>\n<li><strong>\u8fd4\u56de\u7d50\u679c\uff1a<\/strong>\u6700\u7d42\u8fd4\u56de\u5305\u542b\u5206\u7d44\u7d50\u679c\u7684\u6578\u64da\u96c6\u3002<\/li>\n<\/ol>\n<h2 id=\"%e4%bd%bf%e7%94%a8group-by%e7%9a%84%e7%a4%ba%e4%be%8b-dSNiXPAvQS\">\u4f7f\u7528GROUP BY\u7684\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528<code>GROUP BY<\/code>\u7684\u793a\u4f8b\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u540d\u70ba<code>sales<\/code>\u7684\u8868\uff0c\u5305\u542b\u4ee5\u4e0b\u5217\uff1a<code>id<\/code>\u3001<code>product<\/code>\u3001<code>amount<\/code>\u548c<code>sale_date<\/code>\u3002<\/p>\n<pre><code>SELECT product, SUM(amount) AS total_sales\nFROM sales\nWHERE sale_date &gt; '2023-01-01'\nGROUP BY product;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u7522\u54c1\u57282023\u5e741\u67081\u65e5\u4e4b\u5f8c\u7684\u7e3d\u92b7\u552e\u984d\u3002\u901a\u904e<code>GROUP BY<\/code>\uff0c\u6211\u5011\u80fd\u5920\u5c07\u6578\u64da\u6309\u7522\u54c1\u5206\u7d44\uff0c\u4e26\u8a08\u7b97\u6bcf\u500b\u7522\u54c1\u7684\u92b7\u552e\u7e3d\u984d\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-dSNiXPAvQS\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528<code>GROUP BY<\/code>\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5728<code>SELECT<\/code>\u8a9e\u53e5\u4e2d\uff0c\u6240\u6709\u672a\u4f7f\u7528\u805a\u5408\u51fd\u6578\u7684\u5217\u5fc5\u9808\u51fa\u73fe\u5728<code>GROUP BY<\/code>\u5b50\u53e5\u4e2d\u3002<\/li>\n<li>\u5982\u679c\u4e0d\u4f7f\u7528<code>HAVING<\/code>\u5b50\u53e5\uff0c\u5247\u7121\u6cd5\u5c0d\u5206\u7d44\u5f8c\u7684\u7d50\u679c\u9032\u884c\u9032\u4e00\u6b65\u904e\u6ffe\u3002<\/li>\n<li>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528<code>GROUP BY<\/code>\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-dSNiXPAvQS\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684<code>GROUP BY<\/code>\u5b50\u53e5\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5c0d\u6578\u64da\u9032\u884c\u6709\u6548\u7684\u5206\u7d44\u548c\u805a\u5408\u8a08\u7b97\u3002\u901a\u904e\u7406\u89e3\u5176\u5be6\u73fe\u539f\u7406\u548c\u6b63\u78ba\u4f7f\u7528\u8a9e\u6cd5\uff0c\u7528\u6236\u53ef\u4ee5\u66f4\u597d\u5730\u5206\u6790\u548c\u8655\u7406\u6578\u64da\u3002\u5728\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u6642\uff0c\u8003\u616e\u4f7f\u7528<code>VPS<\/code>\u6216<code>\u9999\u6e2f\u4f3a\u670d\u5668<\/code>\u4f86\u63d0\u5347\u6027\u80fd\u548c\u7a69\u5b9a\u6027\uff0c\u60a8\u53ef\u4ee5\u8a2a\u554f<a href=\"https:\/\/server.hk\">Server.HK<\/a>\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0eMySQL\u5206\u7d44\u67e5\u8a62\u7684Group By\u5be6\u73fe\u539f\u7406\uff0c\u89e3\u6790\u5176\u904b\u4f5c\u65b9\u5f0f\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-191206","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/191206","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=191206"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/191206\/revisions"}],"predecessor-version":[{"id":191207,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/191206\/revisions\/191207"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=191206"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=191206"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=191206"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}