{"id":27978,"date":"2024-11-24T08:21:47","date_gmt":"2024-11-24T00:21:47","guid":{"rendered":"https:\/\/fwq.ai\/blog\/27978\/"},"modified":"2024-11-24T08:21:47","modified_gmt":"2024-11-24T00:21:47","slug":"%e5%a6%82%e4%bd%95%e6%9f%a5%e6%89%be%e5%b5%8c%e5%a5%97%e5%9c%a8%e4%b8%8d%e5%90%8c%e5%88%97%e4%b8%ad%e7%9a%84%e6%95%b0%e6%8d%ae%ef%bc%9f-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/27978\/","title":{"rendered":"\u5982\u4f55\u67e5\u627e\u5d4c\u5957\u5728\u4e0d\u540c\u5217\u4e2d\u7684\u6570\u636e\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173137447631532.jpg\" class=\"aligncenter\" title=\"\u5982\u4f55\u67e5\u627e\u5d4c\u5957\u5728\u4e0d\u540c\u5217\u4e2d\u7684\u6570\u636e\uff1f\u63d2\u56fe\" alt=\"\u5982\u4f55\u67e5\u627e\u5d4c\u5957\u5728\u4e0d\u540c\u5217\u4e2d\u7684\u6570\u636e\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u67e5\u627e\u5d4c\u5957\u5728\u4e0d\u540c\u5217\u4e2d\u7684\u6570\u636e<\/strong><\/p>\n<p>\u4f60\u60f3\u5728\u6570\u636e\u8868\u4e2d\u67e5\u627e\u6570\u636e\uff0c\u6ee1\u8db3\u4ee5\u4e0b\u6761\u4ef6\uff1a\u5982\u679c\u76ee\u6807\u5217\u548c a \u5217\u76f8\u7b49\uff0c\u5219\u8fd4\u56de b \u5217\uff1b\u5982\u679c\u76ee\u6807\u5217\u548c b \u5217\u76f8\u7b49\uff0c\u5219\u8fd4\u56de a \u5217\uff1b\u5982\u679c\u4e24\u8005\u90fd\u4e0d\u76f8\u7b49\uff0c\u5219\u4e0d\u8fd4\u56de\u3002<\/p>\n<p><strong>\u4f18\u96c5\u7684\u5199\u6cd5<\/strong><\/p>\n<p>\u4f60\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b sql \u67e5\u8be2\u6765\u5b9e\u73b0\u6b64\u76ee\u7684\uff1a<\/p>\n<pre>select if(target = a, b, a) as \u5b57\u6bb5\u540d\nfrom table\nwhere target = a or target = b;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p><strong>\u67e5\u8be2\u7ed3\u679c<\/strong><\/p>\n<p>\u6839\u636e\u7ed9\u5b9a\u7684\u793a\u4f8b\u6570\u636e\uff0c\u67e5\u8be2\u5c06\u8fd4\u56de\u4ee5\u4e0b\u7ed3\u679c\uff1a<\/p>\n<ul>\n<li>b1<\/li>\n<li>a2<\/li>\n<li>a3<\/li>\n<li>b5<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u67e5\u627e\u5d4c\u5957\u5728\u4e0d\u540c\u5217\u4e2d\u7684\u6570\u636e\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u67e5\u627e\u5d4c\u5957\u5728\u4e0d\u540c\u5217\u4e2d\u7684\u6570\u636e \u4f60\u60f3\u5728\u6570\u636e\u8868\u4e2d\u67e5\u627e\u6570\u636e\uff0c\u6ee1\u8db3\u4ee5\u4e0b\u6761\u4ef6\uff1a\u5982\u679c\u76ee\u6807\u5217\u548c a \u5217\u76f8\u7b49\uff0c\u5219\u8fd4\u56de b \u5217\uff1b\u5982\u679c\u76ee\u6807\u5217\u548c b \u5217\u76f8\u7b49\uff0c\u5219\u8fd4\u56de a \u5217\uff1b\u5982\u679c\u4e24\u8005\u90fd\u4e0d\u76f8\u7b49\uff0c\u5219\u4e0d\u8fd4\u56de\u3002 \u4f18\u96c5\u7684\u5199\u6cd5 \u4f60\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b sql \u67e5\u8be2\u6765\u5b9e\u73b0\u6b64\u76ee\u7684\uff1a select if(target = a, b, a) as \u5b57\u6bb5\u540d from table where target = a or target = b; \u767b\u5f55\u540e\u590d\u5236 \u67e5\u8be2\u7ed3\u679c \u6839\u636e\u7ed9\u5b9a\u7684\u793a\u4f8b\u6570\u636e\uff0c\u67e5\u8be2\u5c06\u8fd4\u56de\u4ee5\u4e0b\u7ed3\u679c\uff1a b1 a2 a3 b5 \u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u67e5\u627e\u5d4c\u5957\u5728\u4e0d\u540c\u5217\u4e2d\u7684\u6570\u636e\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/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-27978","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/27978","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=27978"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/27978\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=27978"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=27978"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=27978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}