{"id":7186,"date":"2024-11-14T09:17:31","date_gmt":"2024-11-14T01:17:31","guid":{"rendered":"https:\/\/fwq.ai\/blog\/7186\/"},"modified":"2024-11-14T09:17:31","modified_gmt":"2024-11-14T01:17:31","slug":"%e5%a6%82%e4%bd%95%e6%9f%a5%e8%af%a2%e5%85%b3%e8%81%94%e8%a1%a8%e4%b8%ad%e6%bb%a1%e8%b6%b3%e7%89%b9%e5%ae%9a%e6%9d%a1%e4%bb%b6%e7%9a%84%e4%b8%a4%e7%bb%84%e6%95%b0%e6%8d%ae%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/7186\/","title":{"rendered":"\u5982\u4f55\u67e5\u8be2\u5173\u8054\u8868\u4e2d\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u7684\u4e24\u7ec4\u6570\u636e\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173059833217106.jpg\" class=\"aligncenter\" title=\"\u5982\u4f55\u67e5\u8be2\u5173\u8054\u8868\u4e2d\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u7684\u4e24\u7ec4\u6570\u636e\uff1f\u63d2\u56fe\" alt=\"\u5982\u4f55\u67e5\u8be2\u5173\u8054\u8868\u4e2d\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u7684\u4e24\u7ec4\u6570\u636e\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u89e3\u51b3  \u5173\u8054\u8868\u67e5\u8be2\u95ee\u9898\uff1f<\/strong><\/p>\n<p>\u8bbe\u6709\u8868 a \u548c b\uff0c\u8868 a \u7684 outer_id \u5217\u8fde\u63a5\u8868 b \u7684 id \u5217\u3002\u73b0\u5728\u9700\u8981\u67e5\u8be2\u8868 a \u7684\u4e24\u7ec4\u6570\u636e\uff1a<\/p>\n<ul>\n<li>\u4e00\u7ec4\u662f\u8868 a \u7684 outer_id \u5173\u8054\u8868 b \u7684 id\uff0c\u5982\u679c\u5173\u8054\uff0ctype \u5217\u4e0d\u80fd\u4e3a 99\uff1b\u5982\u679c\u672a\u5173\u8054\uff0c\u4e5f\u9700\u8981\u8fd9\u7ec4\u6570\u636e\u3002<\/li>\n<li>\u53e6\u4e00\u7ec4\u662f\u8868 b \u5fc5\u987b\u5b58\u5728\uff0c\u5e76\u4e14 type \u5217\u7b49\u4e8e 99\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u67e5\u8be2\u8fd9\u4e24\u7ec4\u6570\u636e\u7684 sql \u8bed\u53e5\uff1a<\/p>\n<p><strong>\u67e5\u8be2\u7b2c\u4e00\u7ec4\u6570\u636e<\/strong><\/p>\n<pre>select a.*\nfrom a a\nleft join b b on b.id = a.outer_id\nwhere b.id is null\n   or (b.id is not null and b.type != 99)<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u67e5\u8be2\u7b2c\u4e8c\u7ec4\u6570\u636e<\/strong><\/p>\n<pre>SELECT a.*\nFROM A a\nINNER JOIN B b ON b.id = a.outer_id AND b.type = 99<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u67e5\u8be2\u5173\u8054\u8868\u4e2d\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u7684\u4e24\u7ec4\u6570\u636e\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":"<p>\u5982\u4f55\u89e3\u51b3 \u5173\u8054\u8868\u67e5\u8be2\u95ee\u9898\uff1f \u8bbe\u6709\u8868 a \u548c b\uff0c\u8868 a \u7684 outer_id \u5217\u8fde\u63a5\u8868 b \u7684 id \u5217\u3002\u73b0\u5728\u9700\u8981\u67e5\u8be2\u8868 a \u7684\u4e24\u7ec4\u6570\u636e\uff1a \u4e00\u7ec4\u662f\u8868 a \u7684 outer_id \u5173\u8054\u8868 b \u7684 id\uff0c\u5982\u679c\u5173\u8054\uff0ctype \u5217\u4e0d\u80fd\u4e3a 99\uff1b\u5982\u679c\u672a\u5173\u8054\uff0c\u4e5f\u9700\u8981\u8fd9\u7ec4\u6570\u636e\u3002 \u53e6\u4e00\u7ec4\u662f\u8868 b \u5fc5\u987b\u5b58\u5728\uff0c\u5e76\u4e14 type \u5217\u7b49\u4e8e 99\u3002 \u4ee5\u4e0b\u662f\u67e5\u8be2\u8fd9\u4e24\u7ec4\u6570\u636e\u7684 sql \u8bed\u53e5\uff1a \u67e5\u8be2\u7b2c\u4e00\u7ec4\u6570\u636e select a.* from a a left join b b on b.id = a.outer_id where b.id is null or (b.id [&hellip;]<\/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-7186","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/7186","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=7186"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/7186\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=7186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=7186"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=7186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}