{"id":185452,"date":"2024-11-10T21:40:18","date_gmt":"2024-11-10T13:40:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/185452\/"},"modified":"2024-11-10T21:40:19","modified_gmt":"2024-11-10T13:40:19","slug":"%e4%bd%bf%e7%94%a8%e8%87%a8%e6%99%82%e8%a1%a8%e5%92%8c%e6%96%87%e4%bb%b6%e6%8e%92%e5%ba%8f%e5%af%a6%e7%8f%begroup-by","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/185452\/","title":{"rendered":"\u4f7f\u7528\u81e8\u6642\u8868\u548c\u6587\u4ef6\u6392\u5e8f\u5be6\u73feGroup By"},"content":{"rendered":"<h1 id=\"%e4%bd%bf%e7%94%a8%e8%87%a8%e6%99%82%e8%a1%a8%e5%92%8c%e6%96%87%e4%bb%b6%e6%8e%92%e5%ba%8f%e5%af%a6%e7%8f%begroup-by-UPHXdvKcRR\">\u4f7f\u7528\u81e8\u6642\u8868\u548c\u6587\u4ef6\u6392\u5e8f\u5be6\u73feGroup By<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c<strong>GROUP BY<\/strong> \u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u529f\u80fd\uff0c\u901a\u5e38\u7528\u65bc\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u5206\u7d44\uff0c\u4ee5\u4fbf\u9032\u884c\u805a\u5408\u8a08\u7b97\u3002\u7136\u800c\uff0c\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528 <strong>GROUP BY<\/strong> \u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u70ba\u4e86\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\uff0c\u4f7f\u7528\u81e8\u6642\u8868\u548c\u6587\u4ef6\u6392\u5e8f\u662f\u4e00\u7a2e\u6709\u6548\u7684\u7b56\u7565\u3002<\/p>\n<h2 id=\"%e8%87%a8%e6%99%82%e8%a1%a8%e7%9a%84%e6%a6%82%e5%bf%b5-UPHXdvKcRR\">\u81e8\u6642\u8868\u7684\u6982\u5ff5<\/h2>\n<p>\u81e8\u6642\u8868\u662f\u4e00\u7a2e\u5728\u6578\u64da\u5eab\u4e2d\u5275\u5efa\u7684\u8868\uff0c\u901a\u5e38\u7528\u65bc\u5b58\u5132\u4e2d\u9593\u7d50\u679c\u3002\u9019\u4e9b\u8868\u5728\u6703\u8a71\u7d50\u675f\u5f8c\u6703\u81ea\u52d5\u522a\u9664\uff0c\u4e26\u4e14\u53ef\u4ee5\u5728\u67e5\u8a62\u904e\u7a0b\u4e2d\u9748\u6d3b\u4f7f\u7528\u3002\u4f7f\u7528\u81e8\u6642\u8868\u7684\u597d\u8655\u5728\u65bc\uff0c\u5b83\u5011\u53ef\u4ee5\u6e1b\u5c11\u67e5\u8a62\u7684\u8907\u96dc\u6027\uff0c\u4e26\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e6%96%87%e4%bb%b6%e6%8e%92%e5%ba%8f%e7%9a%84%e5%8e%9f%e7%90%86-UPHXdvKcRR\">\u6587\u4ef6\u6392\u5e8f\u7684\u539f\u7406<\/h2>\n<p>\u6587\u4ef6\u6392\u5e8f\u662f\u4e00\u7a2e\u5c07\u6578\u64da\u5beb\u5165\u78c1\u789f\u4e26\u9032\u884c\u6392\u5e8f\u7684\u6280\u8853\u3002\u9019\u7a2e\u65b9\u6cd5\u7279\u5225\u9069\u5408\u65bc\u8655\u7406\u7121\u6cd5\u5b8c\u5168\u8f09\u5165\u5167\u5b58\u7684\u5927\u578b\u6578\u64da\u96c6\u3002\u901a\u904e\u5c07\u6578\u64da\u5206\u6279\u5beb\u5165\u78c1\u789f\u4e26\u9032\u884c\u6392\u5e8f\uff0c\u7136\u5f8c\u518d\u5c07\u7d50\u679c\u5408\u4f75\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u5167\u5b58\u4f7f\u7528\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e8%87%a8%e6%99%82%e8%a1%a8%e5%92%8c%e6%96%87%e4%bb%b6%e6%8e%92%e5%ba%8f%e5%af%a6%e7%8f%begroup-by-UPHXdvKcRR\">\u4f7f\u7528\u81e8\u6642\u8868\u548c\u6587\u4ef6\u6392\u5e8f\u5be6\u73feGROUP BY<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u7d50\u5408\u81e8\u6642\u8868\u548c\u6587\u4ef6\u6392\u5e8f\u4f86\u5be6\u73fe <strong>GROUP BY<\/strong> \u7684\u904e\u7a0b\u53ef\u4ee5\u5206\u70ba\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"%e6%ad%a5%e9%a9%9f%e4%b8%80%ef%bc%9a%e5%89%b5%e5%bb%ba%e8%87%a8%e6%99%82%e8%a1%a8-UPHXdvKcRR\">\u6b65\u9a5f\u4e00\uff1a\u5275\u5efa\u81e8\u6642\u8868<\/h3>\n<pre><code>CREATE TEMPORARY TABLE temp_table AS\nSELECT column1, column2, COUNT(*) AS count\nFROM original_table\nGROUP BY column1, column2;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u6b65\u9a5f\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u81e8\u6642\u8868 <code>temp_table<\/code>\uff0c\u4e26\u5c07\u539f\u59cb\u8868 <code>original_table<\/code> \u4e2d\u7684\u6578\u64da\u9032\u884c\u5206\u7d44\uff0c\u8a08\u7b97\u6bcf\u7d44\u7684\u6578\u91cf\u3002<\/p>\n<h3 id=\"%e6%ad%a5%e9%a9%9f%e4%ba%8c%ef%bc%9a%e5%b0%8d%e8%87%a8%e6%99%82%e8%a1%a8%e9%80%b2%e8%a1%8c%e6%96%87%e4%bb%b6%e6%8e%92%e5%ba%8f-UPHXdvKcRR\">\u6b65\u9a5f\u4e8c\uff1a\u5c0d\u81e8\u6642\u8868\u9032\u884c\u6587\u4ef6\u6392\u5e8f<\/h3>\n<p>\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u53ef\u4ee5\u5c0d\u81e8\u6642\u8868\u4e2d\u7684\u6578\u64da\u9032\u884c\u6392\u5e8f\uff0c\u4ee5\u4fbf\u66f4\u9ad8\u6548\u5730\u9032\u884c\u5f8c\u7e8c\u64cd\u4f5c\uff1a<\/p>\n<pre><code>SELECT * FROM temp_table\nORDER BY count DESC;<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u6211\u5011\u5c31\u53ef\u4ee5\u7372\u5f97\u6309\u8a08\u6578\u964d\u5e8f\u6392\u5217\u7684\u7d50\u679c\uff0c\u9019\u5c0d\u65bc\u5f8c\u7e8c\u7684\u6578\u64da\u5206\u6790\u975e\u5e38\u6709\u5e6b\u52a9\u3002<\/p>\n<h3 id=\"%e6%ad%a5%e9%a9%9f%e4%b8%89%ef%bc%9a%e6%9f%a5%e8%a9%a2%e6%9c%80%e7%b5%82%e7%b5%90%e6%9e%9c-UPHXdvKcRR\">\u6b65\u9a5f\u4e09\uff1a\u67e5\u8a62\u6700\u7d42\u7d50\u679c<\/h3>\n<p>\u6700\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u5f9e\u81e8\u6642\u8868\u4e2d\u67e5\u8a62\u6240\u9700\u7684\u6700\u7d42\u7d50\u679c\uff1a<\/p>\n<pre><code>SELECT column1, SUM(count) AS total_count\nFROM temp_table\nGROUP BY column1;<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u6211\u5011\u5c31\u80fd\u5920\u5f97\u5230\u6bcf\u500b <code>column1<\/code> \u7684\u7e3d\u8a08\u6578\uff0c\u4e26\u4e14\u9019\u500b\u904e\u7a0b\u7684\u6027\u80fd\u6703\u6bd4\u76f4\u63a5\u5728\u539f\u59cb\u8868\u4e0a\u9032\u884c <strong>GROUP BY<\/strong> \u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-UPHXdvKcRR\">\u7d50\u8ad6<\/h2>\n<p>\u4f7f\u7528\u81e8\u6642\u8868\u548c\u6587\u4ef6\u6392\u5e8f\u4f86\u5be6\u73fe <strong>GROUP BY<\/strong> \u662f\u4e00\u7a2e\u6709\u6548\u7684\u6578\u64da\u8655\u7406\u7b56\u7565\uff0c\u7279\u5225\u662f\u5728\u9762\u5c0d\u5927\u578b\u6578\u64da\u96c6\u6642\u3002\u9019\u7a2e\u65b9\u6cd5\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u9084\u80fd\u7c21\u5316\u67e5\u8a62\u908f\u8f2f\u3002\u5c0d\u65bc\u9700\u8981\u8655\u7406\u5927\u91cf\u6578\u64da\u7684\u61c9\u7528\u5834\u666f\uff0c\u9019\u7a2e\u6280\u8853\u7121\u7591\u662f\u503c\u5f97\u8003\u616e\u7684\u9078\u64c7\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u80fd\u5920\u6eff\u8db3\u4e0d\u540c\u7528\u6236\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u81e8\u6642\u8868\u7684\u4f7f\u7528\u9084\u662f\u6578\u64da\u8655\u7406\u7684\u5176\u4ed6\u65b9\u9762\uff0c\u6211\u5011\u7684\u670d\u52d9\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528\u81e8\u6642\u8868\u548c\u6587\u4ef6\u6392\u5e8f\u6280\u8853\uff0c\u8f15\u9b06\u5be6\u73fe\u9ad8\u6548\u7684Group By\u64cd\u4f5c\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6027\u80fd\u548c\u67e5\u8a62\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-185452","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185452","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=185452"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185452\/revisions"}],"predecessor-version":[{"id":185453,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185452\/revisions\/185453"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=185452"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=185452"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=185452"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}