{"id":200522,"date":"2025-05-06T11:02:40","date_gmt":"2025-05-06T03:02:40","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200522\/"},"modified":"2025-05-06T11:02:40","modified_gmt":"2025-05-06T03:02:40","slug":"%e4%b8%80%e5%af%b9%e5%a4%9a%e4%b8%9a%e5%8a%a1%e5%85%b3%e7%b3%bb%e5%88%86%e9%a1%b5%e6%9f%a5%e8%af%a2%ef%bc%9a%e5%a6%82%e4%bd%95%e9%ab%98%e6%95%88%e5%9c%b0%e7%94%a8%e5%a4%9a%e7%ab%af%e4%bd%9c%e4%b8%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200522\/","title":{"rendered":"\u4e00\u5bf9\u591a\u4e1a\u52a1\u5173\u7cfb\u5206\u9875\u67e5\u8be2\uff1a\u5982\u4f55\u9ad8\u6548\u5730\u7528\u591a\u7aef\u4f5c\u4e3a\u67e5\u8be2\u6761\u4ef6\u5e76\u5b9e\u73b0\u5206\u9875\u663e\u793a\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u4e00\u5bf9\u591a\u4e1a\u52a1\u5173\u7cfb\u5206\u9875\u67e5\u8be2\uff1a\u5982\u4f55\u9ad8\u6548\u5730\u7528\u591a\u7aef\u4f5c\u4e3a\u67e5\u8be2\u6761\u4ef6\u5e76\u5b9e\u73b0\u5206\u9875\u663e\u793a\uff1f<\/h1>\n<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241107\/1730964638672c6c9e5a8ad.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u4e00\u5bf9\u591a\u4e1a\u52a1\u5173\u7cfb\u5206\u9875\u67e5\u8be2\uff0c\u591a\u7aef\u4f5c\u4e3a\u67e5\u8be2\u6761\u4ef6<\/strong><\/p>\n<p>\u4e1a\u52a1\u5173\u7cfb\u4e3a\u4e00\u5bf9\u591a\u65f6\uff0c\u591a\u7aef\u53ef\u4ee5\u4f5c\u4e3a\u67e5\u8be2\u6761\u4ef6\u5e76\u5206\u9875\u663e\u793a\uff0c\u4e0b\u9762\u63d0\u4f9b\u4e24\u79cd\u8bbe\u8ba1\u601d\u8def\uff1a<\/p>\n<p><strong>\u65b9\u6cd5\u4e00<\/strong><\/p>\n<p>\u4f7f\u7528\u4e24\u5f20\u8868\uff0c\u4e00\u5f20\u5b58\u50a8\u7528\u6237\u4fe1\u606f\uff0c\u53e6\u4e00\u5f20\u5b58\u50a8\u5bf9\u5e94\u6807\u7b7e\uff1a<\/p>\n<ul>\n<li>\n<p>user\u8868\uff1a<\/p>\n<pre>| user_id | name |\n|---------|------|\n| 1       | \u5c0f\u660e |\n| 2       | \u5c0f\u674e |\n| 3       | \u5c0f\u5f20 |<\/pre>\n<\/li>\n<li>\n<p>tag\u8868\uff1a<\/p>\n<pre>| tag_id | user_id | tag   |\n|---------|---------|-------|\n| 1       | 1       | \u6d3b\u6cfc  |\n| 2       | 1       | \u53ef\u7231  |\n| 3       | 2       | \u6d3b\u6cfc  |\n| 4       | 3       | \u53ef\u7231  |<\/pre>\n<\/li>\n<\/ul>\n<p>\u6b64\u65b9\u6cd5\u5b58\u5728\u5982\u4e0b\u95ee\u9898\uff1a<\/p>\n<ul>\n<li>\u4ee5stream\u6d41\u5bf9name\u8fdb\u884c\u5206\u7ec4\uff0c\u6027\u80fd\u4f1a\u56e0\u6570\u636e\u91cf\u589e\u5927\u800c\u4e0b\u964d\u3002<\/li>\n<li>\u82e5\u4ee5tag\u4f5c\u4e3a\u67e5\u8be2\u6761\u4ef6\uff0c\u4f1a\u6f0f\u6389\u5176\u4ed6\u76f8\u5173tag\u3002<\/li>\n<\/ul>\n<p><strong>\u65b9\u6cd5\u4e8c<\/strong><\/p>\n<p>\u91c7\u7528\u5355\u8868\u8bbe\u8ba1\uff0c\u5c06\u6807\u7b7e\u4fe1\u606f\u5b58\u50a8\u5728\u540c\u4e00\u5217\u4e2d\uff1a<\/p>\n<ul>\n<li>\n<p>user\u8868\uff1a<\/p>\n<pre>| user_id | name       | tags         |\n|---------|------------|--------------|\n| 1       | \u5c0f\u660e       | \u6d3b\u6cfc, \u53ef\u7231  |\n| 2       | \u5c0f\u674e       | \u6d3b\u6cfc          |\n| 3       | \u5c0f\u5f20       | \u53ef\u7231          |<\/pre>\n<\/li>\n<\/ul>\n<p>\u6b64\u65b9\u6cd5\u53ef\u4ee5\u89e3\u51b3\u4e0a\u8ff0\u95ee\u9898\uff1a<\/p>\n<ul>\n<li>\u5355\u8868\u67e5\u8be2\u907f\u514d\u4e86\u6d41\u5206\u7ec4\u7684\u6027\u80fd\u5f00\u9500\u3002<\/li>\n<li>\u4f7f\u7528exists\u5b50\u67e5\u8be2\u53ef\u4ee5\u51c6\u786e\u7b5b\u9009\u6ee1\u8db3\u67e5\u8be2\u6761\u4ef6\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n<p>\u5206\u9875\u67e5\u8be2sql\uff1a<\/p>\n<pre>select *, (select group_concat(tag) from tag where user_id = user.id and tag = '\u6d3b\u6cfc') as tags\nfrom user\nwhere exists(select 1 from tag where user_id = user.id and tag = '\u6d3b\u6cfc' limit 1)\nlimit 0, 10;<\/pre>\n<p>\u6700\u7ec8\u7ed3\u679c\uff1a<\/p>\n<pre>| user_id | name       | tags         |\n|---------|------------|--------------|\n| 1       | \u5c0f\u660e       | \u6d3b\u6cfc, \u53ef\u7231  |<\/pre>\n<p>\u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300a\u4e00\u5bf9\u591a\u4e1a\u52a1\u5173\u7cfb\u5206\u9875\u67e5\u8be2\uff1a\u5982\u4f55\u9ad8\u6548\u5730\u7528\u591a\u7aef\u4f5c\u4e3a\u67e5\u8be2\u6761\u4ef6\u5e76\u5b9e\u73b0\u5206\u9875\u663e\u793a\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u5bf9\u591a\u4e1a\u52a1\u5173\u7cfb\u5206\u9875\u67e5\u8be2\uff1a\u5982\u4f55\u9ad8\u6548&#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-200522","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200522","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=200522"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200522\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200522"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200522"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200522"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}