{"id":76222,"date":"2024-10-16T04:52:16","date_gmt":"2024-10-15T20:52:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76222\/"},"modified":"2024-10-16T04:52:16","modified_gmt":"2024-10-15T20:52:16","slug":"mysql%e5%85%a5%e9%96%80%ef%bc%9a%e4%bd%bf%e7%94%a8group-by%e8%aa%9e%e5%8f%a5%e6%a0%b9%e6%93%9a%e6%8c%87%e5%ae%9a%e5%88%97%e4%b8%ad%e7%9b%b8%e5%90%8c%e5%80%bc%e5%b0%8d%e8%a1%8c%e9%80%b2%e8%a1%8c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76222\/","title":{"rendered":"MySQL\u5165\u9580\uff1a\u4f7f\u7528GROUP BY\u8a9e\u53e5\u6839\u64da\u6307\u5b9a\u5217\u4e2d\u76f8\u540c\u503c\u5c0d\u884c\u9032\u884c\u5206\u7d44\u751f\u6210\u805a\u5408\u6578\u64da\u3002"},"content":{"rendered":"<h1 id=\"mysql%e5%85%a5%e9%96%80%ef%bc%9a%e4%bd%bf%e7%94%a8group-by%e8%aa%9e%e5%8f%a5%e6%a0%b9%e6%93%9a%e6%8c%87%e5%ae%9a%e5%88%97%e4%b8%ad%e7%9b%b8%e5%90%8c%e5%80%bc%e5%b0%8d%e8%a1%8c%e9%80%b2%e8%a1%8c-nMRwFDvjoV\">MySQL\u5165\u9580\uff1a\u4f7f\u7528GROUP BY\u8a9e\u53e5\u6839\u64da\u6307\u5b9a\u5217\u4e2d\u76f8\u540c\u503c\u5c0d\u884c\u9032\u884c\u5206\u7d44\u751f\u6210\u805a\u5408\u6578\u64da<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u975e\u5e38\u6d41\u884c\u7684\u9078\u64c7\uff0c\u56e0\u70ba\u5b83\u7684\u9748\u6d3b\u6027\u548c\u5f37\u5927\u7684\u529f\u80fd\u3002\u7576\u6211\u5011\u9700\u8981\u5f9e\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u610f\u7fa9\u7684\u4fe1\u606f\u6642\uff0c\u805a\u5408\u6578\u64da\u7684\u80fd\u529b\u986f\u5f97\u5c24\u70ba\u91cd\u8981\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528MySQL\u7684GROUP BY\u8a9e\u53e5\u4f86\u6839\u64da\u6307\u5b9a\u5217\u4e2d\u7684\u76f8\u540c\u503c\u5c0d\u884c\u9032\u884c\u5206\u7d44\uff0c\u4e26\u751f\u6210\u805a\u5408\u6578\u64da\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afgroup-by%e8%aa%9e%e5%8f%a5%ef%bc%9f-nMRwFDvjoV\">\u4ec0\u9ebc\u662fGROUP BY\u8a9e\u53e5\uff1f<\/h2>\n<p>GROUP BY\u8a9e\u53e5\u662fSQL\u7684\u4e00\u90e8\u5206\uff0c\u7528\u65bc\u5c07\u67e5\u8a62\u7d50\u679c\u4e2d\u7684\u884c\u6839\u64da\u4e00\u500b\u6216\u591a\u500b\u5217\u7684\u503c\u9032\u884c\u5206\u7d44\u3002\u9019\u6a23\u53ef\u4ee5\u5c0d\u6bcf\u500b\u5206\u7d44\u57f7\u884c\u805a\u5408\u51fd\u6578\uff0c\u5982SUM\u3001COUNT\u3001AVG\u7b49\uff0c\u5f9e\u800c\u751f\u6210\u6709\u7528\u7684\u7d71\u8a08\u4fe1\u606f\u3002<\/p>\n<h2 id=\"group-by%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-nMRwFDvjoV\">GROUP BY\u8a9e\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<pre><code>\nSELECT column1, aggregate_function(column2)\nFROM table_name\nWHERE condition\nGROUP BY column1;\n<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>column1<\/code>\u662f\u7528\u4f86\u5206\u7d44\u7684\u5217\uff0c<code>aggregate_function(column2)<\/code>\u662f\u8981\u5c0d\u6bcf\u500b\u5206\u7d44\u57f7\u884c\u7684\u805a\u5408\u51fd\u6578\uff0c<code>table_name<\/code>\u662f\u6578\u64da\u8868\u7684\u540d\u7a31\uff0c<code>condition<\/code>\u662f\u53ef\u9078\u7684\u904e\u6ffe\u689d\u4ef6\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8group-by%e7%9a%84%e5%af%a6%e9%9a%9b%e4%be%8b%e5%ad%90-nMRwFDvjoV\">\u4f7f\u7528GROUP BY\u7684\u5be6\u969b\u4f8b\u5b50<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>sales<\/code>\u7684\u6578\u64da\u8868\uff0c\u8a72\u8868\u5305\u542b\u4ee5\u4e0b\u5217\uff1a<\/p>\n<ul>\n<li><code>id<\/code> &#8211; \u552f\u4e00\u6a19\u8b58\u7b26<\/li>\n<li><code>product<\/code> &#8211; \u7522\u54c1\u540d\u7a31<\/li>\n<li><code>quantity<\/code> &#8211; \u92b7\u552e\u6578\u91cf<\/li>\n<li><code>price<\/code> &#8211; \u55ae\u50f9<\/li>\n<\/ul>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u8a08\u7b97\u6bcf\u7a2e\u7522\u54c1\u7684\u7e3d\u92b7\u552e\u6578\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>\nSELECT product, SUM(quantity) AS total_quantity\nFROM sales\nGROUP BY product;\n<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u7a2e\u7522\u54c1\u7684\u540d\u7a31\u53ca\u5176\u7e3d\u92b7\u552e\u6578\u91cf\u3002<code>SUM(quantity)<\/code>\u51fd\u6578\u8a08\u7b97\u6bcf\u500b\u7522\u54c1\u7684\u92b7\u552e\u6578\u91cf\u7e3d\u548c\uff0c\u800c<code>GROUP BY product<\/code>\u5247\u78ba\u4fdd\u7d50\u679c\u6309\u7522\u54c1\u540d\u7a31\u5206\u7d44\u3002<\/p>\n<h2 id=\"%e5%a4%9a%e5%88%97%e5%88%86%e7%b5%84-nMRwFDvjoV\">\u591a\u5217\u5206\u7d44<\/h2>\n<p>GROUP BY\u8a9e\u53e5\u4e0d\u50c5\u53ef\u4ee5\u6839\u64da\u4e00\u5217\u9032\u884c\u5206\u7d44\uff0c\u9084\u53ef\u4ee5\u6839\u64da\u591a\u5217\u9032\u884c\u5206\u7d44\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u8981\u6839\u64da\u7522\u54c1\u548c\u50f9\u683c\u4f86\u8a08\u7b97\u6bcf\u7a2e\u7522\u54c1\u5728\u4e0d\u540c\u50f9\u683c\u4e0b\u7684\u92b7\u552e\u6578\u91cf\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>\nSELECT product, price, SUM(quantity) AS total_quantity\nFROM sales\nGROUP BY product, price;\n<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u7a2e\u7522\u54c1\u5728\u4e0d\u540c\u50f9\u683c\u4e0b\u7684\u7e3d\u92b7\u552e\u6578\u91cf\uff0c\u63d0\u4f9b\u4e86\u66f4\u8a73\u7d30\u7684\u6578\u64da\u5206\u6790\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8having%e5%ad%90%e5%8f%a5%e9%80%b2%e8%a1%8c%e9%81%8e%e6%bf%be-nMRwFDvjoV\">\u4f7f\u7528HAVING\u5b50\u53e5\u9032\u884c\u904e\u6ffe<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u5e0c\u671b\u5c0d\u5206\u7d44\u5f8c\u7684\u7d50\u679c\u9032\u884c\u9032\u4e00\u6b65\u7684\u904e\u6ffe\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528HAVING\u5b50\u53e5\u3002\u5047\u8a2d\u6211\u5011\u53ea\u60f3\u67e5\u770b\u92b7\u552e\u6578\u91cf\u8d85\u904e100\u7684\u7522\u54c1\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>\nSELECT product, SUM(quantity) AS total_quantity\nFROM sales\nGROUP BY product\nHAVING total_quantity &gt; 100;\n<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>HAVING<\/code>\u5b50\u53e5\u7528\u65bc\u904e\u6ffe\u805a\u5408\u7d50\u679c\uff0c\u78ba\u4fdd\u53ea\u8fd4\u56de\u7b26\u5408\u689d\u4ef6\u7684\u5206\u7d44\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-nMRwFDvjoV\">\u7e3d\u7d50<\/h2>\n<p>\u4f7f\u7528GROUP BY\u8a9e\u53e5\u53ef\u4ee5\u6709\u6548\u5730\u5c0d\u6578\u64da\u9032\u884c\u5206\u7d44\u4e26\u751f\u6210\u805a\u5408\u6578\u64da\uff0c\u9019\u5c0d\u65bc\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u81f3\u95dc\u91cd\u8981\u3002\u7121\u8ad6\u662f\u55ae\u5217\u9084\u662f\u591a\u5217\u5206\u7d44\uff0cMySQL\u90fd\u63d0\u4f9b\u4e86\u9748\u6d3b\u7684\u67e5\u8a62\u65b9\u5f0f\u4f86\u6eff\u8db3\u4e0d\u540c\u7684\u9700\u6c42\u3002\u901a\u904e\u7d50\u5408\u4f7f\u7528\u805a\u5408\u51fd\u6578\u548cHAVING\u5b50\u53e5\uff0c\u60a8\u53ef\u4ee5\u7372\u5f97\u66f4\u6df1\u5165\u7684\u6578\u64da\u6d1e\u5bdf\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u7a69\u5b9a\u548c\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528MySQL\u7684GROUP BY\u8a9e\u53e5\uff0c\u6839\u64da\u6307\u5b9a\u5217\u4e2d\u7684\u76f8\u540c\u503c\u5c0d\u884c\u9032\u884c\u5206\u7d44\uff0c\u751f\u6210\u805a\u5408\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u80fd\u529b\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-76222","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76222","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=76222"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76222\/revisions"}],"predecessor-version":[{"id":76223,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76222\/revisions\/76223"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76222"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76222"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76222"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}