{"id":6814,"date":"2024-11-14T09:01:54","date_gmt":"2024-11-14T01:01:54","guid":{"rendered":"https:\/\/fwq.ai\/blog\/6814\/"},"modified":"2024-11-14T09:01:54","modified_gmt":"2024-11-14T01:01:54","slug":"mysql-join-%e6%93%8d%e4%bd%9c%e4%b8%ad%e4%b8%b4%e6%97%b6%e8%a1%a8%e5%ad%97%e6%ae%b5%e7%bb%93%e6%9e%84%ef%bc%9a%e5%85%a8%e8%bf%9e%e6%8e%a5%e8%bf%98%e6%98%af%e9%83%a8%e5%88%86%e8%bf%9e%e6%8e%a5%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/6814\/","title":{"rendered":"MySQL Join \u64cd\u4f5c\u4e2d\u4e34\u65f6\u8868\u5b57\u6bb5\u7ed3\u6784\uff1a\u5168\u8fde\u63a5\u8fd8\u662f\u90e8\u5206\u8fde\u63a5\uff1f"},"content":{"rendered":"

\"MySQL<\/p>\n

join \u64cd\u4f5c\u4e2d\u7684\u4e34\u65f6\u8868\u5b57\u6bb5\u7ed3\u6784<\/strong><\/p>\n

\u5728 mysql \u4e2d\u6267\u884c\u8868\u8fde\u63a5\u64cd\u4f5c\u65f6\uff0c\u7cfb\u7edf\u4f1a\u751f\u6210\u4e00\u4e2a\u4e34\u65f6\u8868\u3002\u5173\u4e8e\u8fd9\u4e2a\u4e34\u65f6\u8868\u7684\u5b57\u6bb5\u7ed3\u6784\uff0c\u5b58\u5728\u4e24\u79cd\u4e0d\u540c\u7684\u60c5\u51b5\uff1a<\/p>\n

\u60c5\u51b5 1\uff1a\u5168\u8fde\u63a5\u4e34\u65f6\u8868<\/strong><\/p>\n

\u4e34\u65f6\u8868\u4e2d\u5305\u542b\u8fde\u63a5\u8bed\u53e5\u4e2d\u6d89\u53ca\u5230\u7684\u6240\u6709\u8868\u4e2d\u7684\u6240\u6709\u5b57\u6bb5\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4e34\u65f6\u8868\u5c06\u7c7b\u4f3c\u4e8e\u4ee5\u4e0b\u683c\u5f0f\uff1a<\/p>\n

\u4e34\u65f6\u8868 m\uff1a\na.id         a.name        a.status        a.delete_sign        b.id         b.a_id        b.status        b.delete_sign<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u8fd9\u79cd\u5168\u8fde\u63a5\u4e34\u65f6\u8868\u4f1a\u5305\u542b\u5927\u91cf\u5b57\u6bb5\uff0c\u5982\u679c\u8868\u4e2d\u7684\u5b57\u6bb5\u6570\u91cf\u8f83\u591a\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u3002<\/p>\n
\u60c5\u51b5 2\uff1a\u90e8\u5206\u8fde\u63a5\u4e34\u65f6\u8868<\/strong><\/p>\n
\u4e34\u65f6\u8868\u4e2d\u4ec5\u5305\u542b\u8fde\u63a5\u8bed\u53e5\u4e2d\u4f7f\u7528\u7684\u5b57\u6bb5\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4e34\u65f6\u8868\u5c06\u7c7b\u4f3c\u4e8e\u4ee5\u4e0b\u683c\u5f0f\uff1a<\/p>\n
\u4e34\u65f6\u8868 n\uff1a\na.id         a.name        a.status        a.delete_sign        b.delete_sign<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u8fd9\u79cd\u90e8\u5206\u8fde\u63a5\u4e34\u65f6\u8868\u53ea\u5305\u542b\u5fc5\u8981\u7684\u5b57\u6bb5\uff0c\u56e0\u6b64\u4e0d<\/strong>\u4f1a\u5f15\u8d77\u4e0e\u5168\u8fde\u63a5\u4e34\u65f6\u8868\u76f8\u540c\u7a0b\u5ea6\u7684\u6027\u80fd\u95ee\u9898\u3002<\/p>\n
\u5177\u4f53\u60c5\u51b5<\/strong><\/p>\n
\u5728\u60a8\u63d0\u4f9b\u7684\u793a\u4f8b\u4e2d\uff0c\u60a8\u6267\u884c\u4e86\u4ee5\u4e0b\u8fde\u63a5\u8bed\u53e5\uff1a<\/p>\n
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
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u751f\u6210\u7684\u4e34\u65f6\u8868\u5e94\u8be5\u662f \u60c5\u51b5 2<\/strong> \u4e2d\u7684\u90e8\u5206\u8fde\u63a5\u4e34\u65f6\u8868\uff0c\u56e0\u4e3a\u5b83\u53ea\u5305\u542b\u8fde\u63a5\u8bed\u53e5\u4e2d\u4f7f\u7528\u7684\u5b57\u6bb5\u3002\u56e0\u6b64\uff0c\u4e34\u65f6\u8868\u5e94\u8be5\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
\u4e34\u65f6\u8868 n\uff1a\na.id         a.name        a.status        a.delete_sign        b.delete_sign<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4ee5\u4e0a\u5c31\u662fMySQL Join \u64cd\u4f5c\u4e2d\u4e34\u65f6\u8868\u5b57\u6bb5\u7ed3\u6784\uff1a\u5168\u8fde\u63a5\u8fd8\u662f\u90e8\u5206\u8fde\u63a5\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
join \u64cd\u4f5c\u4e2d\u7684\u4e34\u65f6\u8868\u5b57\u6bb5\u7ed3\u6784 \u5728 mysql \u4e2d\u6267\u884c\u8868\u8fde\u63a5\u64cd\u4f5c\u65f6\uff0c\u7cfb\u7edf\u4f1a\u751f\u6210\u4e00\u4e2a\u4e34\u65f6\u8868\u3002\u5173\u4e8e\u8fd9\u4e2a\u4e34\u65f6\u8868\u7684\u5b57\u6bb5\u7ed3\u6784\uff0c\u5b58\u5728\u4e24\u79cd\u4e0d\u540c\u7684\u60c5\u51b5\uff1a \u60c5\u51b5 1\uff1a\u5168\u8fde\u63a5\u4e34\u65f6\u8868 \u4e34\u65f6\u8868\u4e2d\u5305\u542b\u8fde\u63a5\u8bed\u53e5\u4e2d\u6d89\u53ca\u5230\u7684\u6240\u6709\u8868\u4e2d\u7684\u6240\u6709\u5b57\u6bb5\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4e34\u65f6\u8868\u5c06\u7c7b\u4f3c\u4e8e\u4ee5\u4e0b\u683c\u5f0f\uff1a \u4e34\u65f6\u8868 m\uff1a a.id a.name a.status a.delete_sign b.id b.a_id b.status b.delete_sign \u767b\u5f55\u540e\u590d\u5236 \u8fd9\u79cd\u5168\u8fde\u63a5\u4e34\u65f6\u8868\u4f1a\u5305\u542b\u5927\u91cf\u5b57\u6bb5\uff0c\u5982\u679c\u8868\u4e2d\u7684\u5b57\u6bb5\u6570\u91cf\u8f83\u591a\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u3002 \u60c5\u51b5 2\uff1a\u90e8\u5206\u8fde\u63a5\u4e34\u65f6\u8868 \u4e34\u65f6\u8868\u4e2d\u4ec5\u5305\u542b\u8fde\u63a5\u8bed\u53e5\u4e2d\u4f7f\u7528\u7684\u5b57\u6bb5\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4e34\u65f6\u8868\u5c06\u7c7b\u4f3c\u4e8e\u4ee5\u4e0b\u683c\u5f0f\uff1a \u4e34\u65f6\u8868 n\uff1a a.id a.name a.status a.delete_sign b.delete_sign \u767b\u5f55\u540e\u590d\u5236 \u767b\u5f55\u540e\u590d\u5236 \u8fd9\u79cd\u90e8\u5206\u8fde\u63a5\u4e34\u65f6\u8868\u53ea\u5305\u542b\u5fc5\u8981\u7684\u5b57\u6bb5\uff0c\u56e0\u6b64\u4e0d\u4f1a\u5f15\u8d77\u4e0e\u5168\u8fde\u63a5\u4e34\u65f6\u8868\u76f8\u540c\u7a0b\u5ea6\u7684\u6027\u80fd\u95ee\u9898\u3002 \u5177\u4f53\u60c5\u51b5 \u5728\u60a8\u63d0\u4f9b\u7684\u793a\u4f8b\u4e2d\uff0c\u60a8\u6267\u884c\u4e86\u4ee5\u4e0b\u8fde\u63a5\u8bed\u53e5\uff1a select a.id, a.name, a.status, a.delete_sign from a a inner join b b on a.id = b.a_id where b.delete_sign = 0; […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-6814","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6814","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=6814"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/6814\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=6814"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=6814"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=6814"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}