{"id":200393,"date":"2025-05-06T08:24:05","date_gmt":"2025-05-06T00:24:05","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200393\/"},"modified":"2025-05-06T08:24:05","modified_gmt":"2025-05-06T00:24:05","slug":"mysql-join-%e6%9f%a5%e8%af%a2%e4%b8%ad%e4%b8%b4%e6%97%b6%e8%a1%a8%e4%bc%9a%e5%8c%85%e5%90%ab%e5%93%aa%e4%ba%9b%e5%ad%97%e6%ae%b5%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200393\/","title":{"rendered":"MySQL JOIN \u67e5\u8be2\u4e2d\u4e34\u65f6\u8868\u4f1a\u5305\u542b\u54ea\u4e9b\u5b57\u6bb5\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>MySQL JOIN \u67e5\u8be2\u4e2d\u4e34\u65f6\u8868\u4f1a\u5305\u542b\u54ea\u4e9b\u5b57\u6bb5\uff1f<\/h1>\n<p>\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u90fd\u6253\u5f00\u8fd9\u7bc7\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\uff0c\u5b66\u4e0b\u53bb\u5427\uff01\u672c\u6587\u4e3b\u8981\u4f1a\u7ed9\u5927\u5bb6\u8bb2\u5230\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5927\u5bb6\u5bf9\u672c\u6587\u6709\u597d\u7684\u5efa\u8bae\u6216\u8005\u770b\u5230\u6709\u4e0d\u8db3\u4e4b\u5904\uff0c\u975e\u5e38\u6b22\u8fce\u5927\u5bb6\u79ef\u6781\u63d0\u51fa\uff01\u5728\u540e\u7eed\u6587\u7ae0\u6211\u4f1a\u7ee7\u7eed\u66f4\u65b0\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241104\/17306804266728166a0dbf3.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>mysql join\u67e5\u8be2\u4e2d\u4e34\u65f6\u8868\u5b57\u6bb5\u8003\u5bdf<\/strong><\/p>\n<p>\u5f53mysql\u6267\u884cjoin\u67e5\u8be2\u65f6\uff0c\u4f1a\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u8868\u6765\u5b58\u50a8\u67e5\u8be2\u7ed3\u679c\u3002\u901a\u5e38\uff0c\u4e34\u65f6\u8868\u5305\u542b join \u4e2d\u6240\u6709\u8868\u7684\u5b57\u6bb5\u3002\u7136\u800c\uff0c\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4e34\u65f6\u8868\u53ef\u80fd\u4f1a\u5305\u542b\u66f4\u5c11\u7684\u5b57\u6bb5\uff0c\u5177\u4f53\u53d6\u51b3\u4e8e join \u7684\u6761\u4ef6\u3002<\/p>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u8868 a \u548c\u8868 b\uff0c\u5b83\u4eec\u5206\u522b\u5305\u542b 4 \u4e2a\u5b57\u6bb5\uff1a<\/p>\n<p><strong>\u8868 a<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>\u5b57\u6bb5\u540d<\/th>\n<th>\u6570\u636e\u7c7b\u578b<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>id<\/td>\n<td>int<\/td>\n<\/tr>\n<tr>\n<td>name<\/td>\n<td>varchar(255)<\/td>\n<\/tr>\n<tr>\n<td>status<\/td>\n<td>int<\/td>\n<\/tr>\n<tr>\n<td>delete_sign<\/td>\n<td>tinyint(1)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u8868 b<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>\u5b57\u6bb5\u540d<\/th>\n<th>\u6570\u636e\u7c7b\u578b<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>id<\/td>\n<td>int<\/td>\n<\/tr>\n<tr>\n<td>a_id<\/td>\n<td>int<\/td>\n<\/tr>\n<tr>\n<td>status<\/td>\n<td>int<\/td>\n<\/tr>\n<tr>\n<td>delete_sign<\/td>\n<td>tinyint(1)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6211\u4eec\u6267\u884c\u4ee5\u4e0b sql \u67e5\u8be2\uff1a<\/p>\n<pre>SELECT a.id, a.name, a.status, a.delete_sign \nFROM A a \nINNER JOIN B b ON a.id = b.a_id \nWHERE b.delete_sign = 0;<\/pre>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u751f\u6210\u7684\u4e34\u65f6\u8868\u5e94\u8be5\u662f<strong>n<\/strong>\uff0c\u53ea\u5305\u542b\u8868 a \u7684\u5fc5\u8981\u5b57\u6bb5\u548c\u8868 b \u4e2d\u7684 <strong>delete_sign<\/strong> \u5b57\u6bb5\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<p><strong>\u4e34\u65f6\u8868 n<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>\u5b57\u6bb5\u540d<\/th>\n<th>\u6570\u636e\u7c7b\u578b<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>a.id<\/td>\n<td>int<\/td>\n<\/tr>\n<tr>\n<td>a.name<\/td>\n<td>varchar(255)<\/td>\n<\/tr>\n<tr>\n<td>a.status<\/td>\n<td>int<\/td>\n<\/tr>\n<tr>\n<td>a.delete_sign<\/td>\n<td>tinyint(1)<\/td>\n<\/tr>\n<tr>\n<td>b.delete_sign<\/td>\n<td>tinyint(1)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u901a\u8fc7\u4f7f\u7528\u8f83\u5c11\u5b57\u6bb5\u7684\u4e34\u65f6\u8868\uff0cmysql \u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\uff0c\u56e0\u4e3a\u5b58\u50a8\u548c\u5904\u7406\u7684\u6570\u636e\u91cf\u66f4\u5c0f\u3002<\/p>\n<p>\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300aMySQL JOIN \u67e5\u8be2\u4e2d\u4e34\u65f6\u8868\u4f1a\u5305\u542b\u54ea\u4e9b\u5b57\u6bb5\uff1f\u300b\u7684\u4ecb\u7ecd\u5e94\u8be5\u8ba9\u4f60\u6536\u83b7\u591a\u591a\u4e86\u5427\uff01\u6b22\u8fce\u5927\u5bb6\u6536\u85cf\u6216\u5206\u4eab\u7ed9\u66f4\u591a\u9700\u8981\u5b66\u4e60\u7684\u670b\u53cb\u5427~\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03\u6570\u636e\u5e93\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>MySQL JOIN \u67e5\u8be2\u4e2d\u4e34\u65f6&#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-200393","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200393","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=200393"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200393\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200393"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200393"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200393"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}