{"id":78626,"date":"2024-10-16T12:06:16","date_gmt":"2024-10-16T04:06:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78626\/"},"modified":"2024-10-16T12:06:16","modified_gmt":"2024-10-16T04:06:16","slug":"mysql%e6%8c%87%e4%bb%a4-group-by%ef%bc%88%e5%88%86%e7%b5%84%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78626\/","title":{"rendered":"MySQL\u6307\u4ee4: GROUP BY\uff08\u5206\u7d44\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-group-by%ef%bc%88%e5%88%86%e7%b5%84%ef%bc%89-MqCvbsfEhf\">MySQL\u6307\u4ee4: GROUP BY\uff08\u5206\u7d44\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u8655\u7406\u548c\u5206\u6790\u8cc7\u6599\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f<strong>GROUP BY<\/strong>\u6307\u4ee4\u3002\u9019\u500b\u6307\u4ee4\u5728\u9032\u884c\u8cc7\u6599\u5206\u7d44\u548c\u805a\u5408\u8a08\u7b97\u6642\u975e\u5e38\u6709\u7528\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u5f9e\u5927\u91cf\u8cc7\u6599\u4e2d\u63d0\u53d6\u6709\u610f\u7fa9\u7684\u8cc7\u8a0a\u6642\u3002<\/p>\n<h2 id=\"group-by%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-MqCvbsfEhf\">GROUP BY\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>GROUP BY\u6307\u4ee4\u7684\u4e3b\u8981\u529f\u80fd\u662f\u5c07\u67e5\u8a62\u7d50\u679c\u4e2d\u7684\u8cc7\u6599\u6839\u64da\u4e00\u500b\u6216\u591a\u500b\u6b04\u4f4d\u9032\u884c\u5206\u7d44\u3002\u9019\u6a23\u53ef\u4ee5\u5c0d\u6bcf\u500b\u5206\u7d44\u9032\u884c\u805a\u5408\u8a08\u7b97\uff0c\u4f8b\u5982\u8a08\u7b97\u7e3d\u548c\u3001\u5e73\u5747\u503c\u3001\u8a08\u6578\u7b49\u3002\u4f7f\u7528GROUP BY\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT \u6b04\u4f4d1, \u805a\u5408\u51fd\u6578(\u6b04\u4f4d2)\nFROM \u8868\u683c\u540d\u7a31\nWHERE \u689d\u4ef6\nGROUP BY \u6b04\u4f4d1;<\/code><\/pre>\n<h2 id=\"group-by%e7%9a%84%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-MqCvbsfEhf\">GROUP BY\u7684\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<strong>sales<\/strong>\u7684\u8cc7\u6599\u8868\uff0c\u8a72\u8868\u5305\u542b\u4ee5\u4e0b\u6b04\u4f4d\uff1a<\/p>\n<ul>\n<li>id<\/li>\n<li>product_name<\/li>\n<li>quantity<\/li>\n<li>sale_date<\/li>\n<\/ul>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u8a08\u7b97\u6bcf\u500b\u7522\u54c1\u7684\u7e3d\u92b7\u552e\u6578\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u7684SQL\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT product_name, SUM(quantity) AS total_quantity\nFROM sales\nGROUP BY product_name;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u6703\u8fd4\u56de\u6bcf\u500b\u7522\u54c1\u7684\u540d\u7a31\u53ca\u5176\u5c0d\u61c9\u7684\u7e3d\u92b7\u552e\u6578\u91cf\u3002GROUP BY\u6307\u4ee4\u5728\u9019\u88e1\u5c07\u8cc7\u6599\u6839\u64da<strong>product_name<\/strong>\u9032\u884c\u5206\u7d44\uff0c\u4e26\u4f7f\u7528SUM\u51fd\u6578\u8a08\u7b97\u6bcf\u500b\u5206\u7d44\u7684\u6578\u91cf\u7e3d\u548c\u3002<\/p>\n<h2 id=\"group-by%e8%88%87having%e7%9a%84%e7%b5%90%e5%90%88%e4%bd%bf%e7%94%a8-MqCvbsfEhf\">GROUP BY\u8207HAVING\u7684\u7d50\u5408\u4f7f\u7528<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u5c0d\u5206\u7d44\u5f8c\u7684\u7d50\u679c\u9032\u884c\u9032\u4e00\u6b65\u7684\u904e\u6ffe\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528<strong>HAVING<\/strong>\u5b50\u53e5\u3002HAVING\u5b50\u53e5\u901a\u5e38\u7528\u65bc\u805a\u5408\u51fd\u6578\u7684\u904e\u6ffe\uff0c\u8207WHERE\u5b50\u53e5\u4e0d\u540c\uff0c\u5f8c\u8005\u662f\u5728\u5206\u7d44\u4e4b\u524d\u9032\u884c\u904e\u6ffe\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u53ea\u60f3\u67e5\u8a62\u92b7\u552e\u6578\u91cf\u5927\u65bc100\u7684\u7522\u54c1\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT product_name, SUM(quantity) AS total_quantity\nFROM sales\nGROUP BY product_name\nHAVING total_quantity &gt; 100;<\/code><\/pre>\n<h2 id=\"group-by%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-MqCvbsfEhf\">GROUP BY\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528GROUP BY\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5728SELECT\u8a9e\u53e5\u4e2d\uff0c\u9664\u4e86\u805a\u5408\u51fd\u6578\u5916\uff0c\u6240\u6709\u7684\u6b04\u4f4d\u90fd\u5fc5\u9808\u51fa\u73fe\u5728GROUP BY\u5b50\u53e5\u4e2d\u3002<\/li>\n<li>GROUP BY\u7684\u9806\u5e8f\u6703\u5f71\u97ff\u67e5\u8a62\u7d50\u679c\u7684\u6392\u5217\uff0c\u901a\u5e38\u6703\u6309\u7167\u5206\u7d44\u6b04\u4f4d\u7684\u5b57\u6bcd\u9806\u5e8f\u9032\u884c\u6392\u5e8f\u3002<\/li>\n<li>\u5728\u4f7f\u7528HAVING\u5b50\u53e5\u6642\uff0c\u5fc5\u9808\u78ba\u4fdd\u805a\u5408\u51fd\u6578\u7684\u6b63\u78ba\u6027\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-MqCvbsfEhf\">\u7e3d\u7d50<\/h2>\n<p>GROUP BY\u6307\u4ee4\u5728MySQL\u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u5c0d\u8cc7\u6599\u9032\u884c\u5206\u7d44\u548c\u805a\u5408\u8a08\u7b97\u3002\u7121\u8ad6\u662f\u5728\u5546\u696d\u5206\u6790\u3001\u5831\u544a\u751f\u6210\u9084\u662f\u8cc7\u6599\u6316\u6398\u4e2d\uff0c\u638c\u63e1GROUP BY\u7684\u4f7f\u7528\u90fd\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u900f\u904e\u6b63\u78ba\u7684\u4f7f\u7528GROUP BY\uff0c\u60a8\u53ef\u4ee5\u5f9e\u8cc7\u6599\u4e2d\u63d0\u53d6\u51fa\u6709\u50f9\u503c\u7684\u898b\u89e3\uff0c\u9032\u800c\u505a\u51fa\u66f4\u660e\u667a\u7684\u6c7a\u7b56\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u76f8\u95dc\u6280\u8853\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u63a2\u7d22\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u89e3\u6c7a\u65b9\u6848\uff0c\u8b93\u60a8\u7684\u8cc7\u6599\u7ba1\u7406\u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684GROUP BY\u6307\u4ee4\uff0c\u5982\u4f55\u6709\u6548\u5730\u5206\u7d44\u6578\u64da\u4ee5\u9032\u884c\u805a\u5408\u67e5\u8a62\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\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-78626","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78626","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=78626"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78626\/revisions"}],"predecessor-version":[{"id":78627,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78626\/revisions\/78627"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78626"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78626"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78626"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}