{"id":200989,"date":"2025-05-06T13:50:41","date_gmt":"2025-05-06T05:50:41","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200989\/"},"modified":"2025-05-06T13:50:41","modified_gmt":"2025-05-06T05:50:41","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8sql%e6%9f%a5%e8%af%a2%e6%89%be%e5%88%b0%e5%8c%85%e5%90%ab%e7%89%b9%e5%ae%9a%e7%b1%bb%e7%9b%ae%e7%9a%84%e4%ba%a7%e5%93%81%ef%bc%8c%e5%b9%b6%e5%9c%a8%e4%ba%a7","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200989\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528SQL\u67e5\u8be2\u627e\u5230\u5305\u542b\u7279\u5b9a\u7c7b\u76ee\u7684\u4ea7\u54c1\uff0c\u5e76\u5728\u4ea7\u54c1\u6269\u5c55\u5206\u7c7b\u8868\u4e2d\u67e5\u627e\u76f8\u5173\u4ea7\u54c1\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5982\u4f55\u4f7f\u7528SQL\u67e5\u8be2\u627e\u5230\u5305\u542b\u7279\u5b9a\u7c7b\u76ee\u7684\u4ea7\u54c1\uff0c\u5e76\u5728\u4ea7\u54c1\u6269\u5c55\u5206\u7c7b\u8868\u4e2d\u67e5\u627e\u76f8\u5173\u4ea7\u54c1\uff1f<\/h1>\n<p>\u6700\u8fd1\u53d1\u73b0\u4e0d\u5c11\u5c0f\u4f19\u4f34\u90fd\u5bf9\u5f88\u611f\u5174\u8da3\uff0c\u6240\u4ee5\u4eca\u5929\u7ee7\u7eed\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u76f8\u5173\u7684\u77e5\u8bc6\uff0c\u672c\u6587\u4e3b\u8981\u5185\u5bb9\u6d89\u53ca\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01\u5f53\u7136\u5982\u679c\u9605\u8bfb\u672c\u6587\u65f6\u5b58\u5728\u4e0d\u540c\u60f3\u6cd5\uff0c\u53ef\u4ee5\u5728\u8bc4\u8bba\u4e2d\u8868\u8fbe\uff0c\u4f46\u662f\u8bf7\u52ff\u4f7f\u7528\u8fc7\u6fc0\u7684\u63aa\u8f9e~<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241124\/17324437116742fe3fd1bf5.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>mysql \u67e5\u8be2\u5bfb\u627e\u5305\u542b\u7279\u5b9a\u7c7b\u76ee\u7684\u4ea7\u54c1<\/strong><\/p>\n<p>\u7ed9\u5b9a\u4e24\u4e2a\u8868\uff1a\u4ea7\u54c1\u8868 t_product \u548c\u4ea7\u54c1\u6269\u5c55\u5206\u7c7b\u8868 t_product_category\u3002\u5176\u4e2d t_product \u8868\u5305\u542b\u5b57\u6bb5 product_id\u3001category_id\u3001title \u548c seq\uff0c\u800c t_product_category \u8868\u5305\u542b\u5b57\u6bb5 product_id \u548c category_id\u3002<\/p>\n<p>\u4efb\u52a1\u662f\u6839\u636e\u6307\u5b9a\u7684 category_id \u67e5\u627e\u4ea7\u54c1\u3002\u5982\u679c\u76f8\u5173\u4ea7\u54c1\u5728 t_product \u8868\u4e2d\u627e\u4e0d\u5230\uff0c\u5219\u9700\u8981\u5728 t_product_category \u8868\u4e2d\u641c\u7d22\u3002<\/p>\n<p><strong>\u67e5\u8be2\u8bed\u53e5\uff1a<\/strong><\/p>\n<pre>SELECT p.*\nFROM t_product AS p\nLEFT JOIN t_product_category AS pc ON p.product_id = pc.product_id\nWHERE p.category_id IN (1,2) OR pc.category_id IN (1,2)\nGROUP BY p.product_id\nORDER BY p.seq ASC, p.product_id DESC\nLIMIT 0, 20<\/pre>\n<p><strong>\u67e5\u8be2\u89e3\u91ca\uff1a<\/strong><\/p>\n<ul>\n<li>\u4f7f\u7528 left join \u5c06 t_product \u8868\u4e0e t_product_category \u8868\u8fde\u63a5\uff0c\u4ee5\u67e5\u627e\u5177\u6709\u6307\u5b9a category_id \u7684\u4ea7\u54c1\uff0c\u6216\u5728 t_product_category \u8868\u4e2d\u5177\u6709\u6269\u5c55\u7c7b\u76ee\u7684\u4ea7\u54c1\u3002<\/li>\n<li>where \u5b50\u53e5\u68c0\u67e5 t_product \u8868\u7684 category_id \u662f\u5426\u5339\u914d\u7ed9\u5b9a\u7684 category_id\uff081 \u6216 2\uff09\uff0c\u6216 t_product_category \u8868\u7684 category_id \u662f\u5426\u5339\u914d\u7ed9\u5b9a\u7684 category_id\uff081 \u6216 2\uff09\u3002<\/li>\n<li>group by \u5b50\u53e5\u6839\u636e\u4ea7\u54c1 id \u5bf9\u7ed3\u679c\u8fdb\u884c\u5206\u7ec4\uff0c\u4ee5\u786e\u4fdd\u6bcf\u4e2a\u4ea7\u54c1\u53ea\u51fa\u73b0\u4e00\u6b21\u3002<\/li>\n<li>order by \u5b50\u53e5\u6309 seq \u5347\u5e8f\u548c product_id \u964d\u5e8f\u5bf9\u7ed3\u679c\u8fdb\u884c\u6392\u5e8f\u3002<\/li>\n<li>limit 0, 20 \u5b50\u53e5\u9650\u5236\u8fd4\u56de\u7684\u524d 20 \u6761\u7ed3\u679c\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\u4e3b\u673a\u5b9d\u8d1d\uff01\u66f4\u591a\u5173\u4e8e\u6570\u636e\u5e93\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u3002<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u4f7f\u7528SQL\u67e5\u8be2\u627e\u5230\u5305\u542b\u7279\u5b9a\u7c7b&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200989","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200989","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200989"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200989\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200989"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200989"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200989"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}