{"id":32799,"date":"2023-05-31T16:32:19","date_gmt":"2023-05-31T08:32:19","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=32799"},"modified":"2023-07-31T00:20:34","modified_gmt":"2023-07-30T16:20:34","slug":"%e9%ab%98%e7%ba%a7%e5%ad%90%e6%9f%a5%e8%af%a2%e3%80%81%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%af%a2%e3%80%81%e7%9b%b8%e5%85%b3%e5%ad%90%e6%9f%a5%e8%af%a2%e3%80%81%e6%99%ae%e9%80%9a%e5%ad%90%e6%9f%a5","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/32799.html","title":{"rendered":"\u9ad8\u7ea7\u5b50\u67e5\u8be2\u3001\u5d4c\u5957\u5b50\u67e5\u8be2\u3001\u76f8\u5173\u5b50\u67e5\u8be2\u3001\u666e\u901a\u5b50\u67e5\u8be2\u7684\u533a\u522b"},"content":{"rendered":"<blockquote class=\"wp-block-quote\">\n<p>\u9ad8\u7ea7\u5b50\u67e5\u8be2\u3001\u5d4c\u5957\u5b50\u67e5\u8be2\u3001\u76f8\u5173\u5b50\u67e5\u8be2\u3001\u666e\u901a\u5b50\u67e5\u8be2\u7684\u533a\u522b\u662f\uff1a\u9ad8\u7ea7\u5b50\u67e5\u8be2\u548c\u76f8\u5173\u5b50\u67e5\u8be2\u662f\u5b58\u5728\u5173\u8054\u5173\u7cfb\u7684\u5b50\u67e5\u8be2\u5f62\u5f0f\uff0c\u800c\u5d4c\u5957\u5b50\u67e5\u8be2\u548c\u666e\u901a\u5b50\u67e5\u8be2\u5219\u662f\u72ec\u7acb\u7684\u5b50\u67e5\u8be2\u5f62\u5f0f\u3002<\/p>\n<\/blockquote>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" alt=\"\" class=\"wp-image-32802\" decoding=\"async\" height=\"421\" sizes=\"(max-width: 680px) 100vw, 680px\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u95ee\u7b54\u6a21\u677f680-\u00d7-421-\u50cf\u7d20-2023-05-31T162852.034.jpg?x-oss-process=image\/auto-orient,1\/format,webp\" srcset=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u95ee\u7b54\u6a21\u677f680-\u00d7-421-\u50cf\u7d20-2023-05-31T162852.034.jpg?x-oss-process=image\/auto-orient,1\/format,webp 680w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u95ee\u7b54\u6a21\u677f680-\u00d7-421-\u50cf\u7d20-2023-05-31T162852.034-300x186.jpg 300w\" width=\"680\"\/><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u9ad8\u7ea7\u5b50\u67e5\u8be2\u3001\u5d4c\u5957\u5b50\u67e5\u8be2\u3001\u76f8\u5173\u5b50\u67e5\u8be2\u3001\u666e\u901a\u5b50\u67e5\u8be2\u7684\u533a\u522b<\/h2>\n<p>\u9ad8\u7ea7\u5b50\u67e5\u8be2\u548c\u76f8\u5173\u5b50\u67e5\u8be2\u662f\u5b58\u5728\u5173\u8054\u5173\u7cfb\u7684\u5b50\u67e5\u8be2\u5f62\u5f0f\uff0c\u800c\u5d4c\u5957\u5b50\u67e5\u8be2\u548c\u666e\u901a\u5b50\u67e5\u8be2\u5219\u662f\u72ec\u7acb\u7684\u5b50\u67e5\u8be2\u5f62\u5f0f\u3002<\/p>\n<h3 class=\"wp-block-heading\">1\u3001\u9ad8\u7ea7\u5b50\u67e5\u8be2\uff08Correlated Subquery\uff09<\/h3>\n<p>\u7279\u70b9\uff1a\u9ad8\u7ea7\u5b50\u67e5\u8be2\u4e0e\u5916\u90e8\u67e5\u8be2\u4e4b\u95f4\u5b58\u5728\u5173\u8054\u5173\u7cfb\uff0c\u5b50\u67e5\u8be2\u7684\u7ed3\u679c\u4f9d\u8d56\u4e8e\u5916\u90e8\u67e5\u8be2\u7684\u503c\u3002\u5b50\u67e5\u8be2\u4e2d\u7684\u6bcf\u4e00\u884c\u90fd\u4e0e\u5916\u90e8\u67e5\u8be2\u7684\u6bcf\u4e00\u884c\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n<p>\u7528\u6cd5\uff1a\u5b50\u67e5\u8be2\u4e2d\u7684\u5217\u5f15\u7528\u4e86\u5916\u90e8\u67e5\u8be2\u7684\u5217\uff0c\u5e38\u7528\u4e8e\u9700\u8981\u5bf9\u5916\u90e8\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u7b5b\u9009\u6216\u9650\u5236\u7684\u60c5\u51b5\u3002<\/p>\n<h3 class=\"wp-block-heading\">2\u3001\u5d4c\u5957\u5b50\u67e5\u8be2\uff08Nested Subquery\uff09<\/h3>\n<p>\u7279\u70b9\uff1a\u5d4c\u5957\u5b50\u67e5\u8be2\u662f\u5c06\u4e00\u4e2a\u67e5\u8be2\u8bed\u53e5\u5d4c\u5957\u5728\u53e6\u4e00\u4e2a\u67e5\u8be2\u8bed\u53e5\u4e2d\u7684\u5b50\u67e5\u8be2\u3002\u5185\u90e8\u7684\u5b50\u67e5\u8be2\u5148\u6267\u884c\uff0c\u8fd4\u56de\u7ed3\u679c\u540e\u4f5c\u4e3a\u5916\u90e8\u67e5\u8be2\u7684\u6761\u4ef6\u6216\u6570\u636e\u6e90\u3002<\/p>\n<p>\u7528\u6cd5\uff1a\u5185\u90e8\u5b50\u67e5\u8be2\u7684\u7ed3\u679c\u53ef\u4ee5\u7528\u4e8e\u5916\u90e8\u67e5\u8be2\u7684\u6bd4\u8f83\u3001\u7b5b\u9009\u6216\u4f5c\u4e3a\u6570\u636e\u6e90\u3002<\/p>\n<h3 class=\"wp-block-heading\">3\u3001\u76f8\u5173\u5b50\u67e5\u8be2\uff08Correlated Subquery\uff09<\/h3>\n<p>\u7279\u70b9\uff1a\u76f8\u5173\u5b50\u67e5\u8be2\u4e0e\u9ad8\u7ea7\u5b50\u67e5\u8be2\u7684\u6982\u5ff5\u76f8\u4f3c\uff0c\u4f46\u4e0e\u5916\u90e8\u67e5\u8be2\u4e4b\u95f4\u7684\u5173\u8054\u65b9\u5f0f\u7565\u6709\u4e0d\u540c\u3002\u76f8\u5173\u5b50\u67e5\u8be2\u4f7f\u7528\u5916\u90e8\u67e5\u8be2\u4e2d\u7684\u503c\u4f5c\u4e3a\u8fc7\u6ee4\u6761\u4ef6\uff0c\u4ee5\u9650\u5236\u5b50\u67e5\u8be2\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u7528\u6cd5\uff1a\u76f8\u5173\u5b50\u67e5\u8be2\u901a\u5e38\u4f7f\u7528\u5916\u90e8\u67e5\u8be2\u7684\u5217\u4f5c\u4e3a\u5b50\u67e5\u8be2\u7684\u6761\u4ef6\u3002<\/p>\n<h3 class=\"wp-block-heading\">4\u3001\u666e\u901a\u5b50\u67e5\u8be2\uff08Scalar Subquery\uff09<\/h3>\n<p>\u7279\u70b9\uff1a\u666e\u901a\u5b50\u67e5\u8be2\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\u5b50\u67e5\u8be2\u8bed\u53e5\uff0c\u8fd4\u56de\u5355\u4e2a\u503c\u4f5c\u4e3a\u5916\u90e8\u67e5\u8be2\u7684\u4e00\u90e8\u5206\uff0c\u901a\u5e38\u7528\u4e8e\u4f5c\u4e3a\u8868\u8fbe\u5f0f\u7684\u4e00\u90e8\u5206\u6216\u8d4b\u503c\u7ed9\u53d8\u91cf\u3002<\/p>\n<p>\u7528\u6cd5\uff1a\u666e\u901a\u5b50\u67e5\u8be2\u5e38\u7528\u4e8e\u83b7\u53d6\u5355\u4e2a\u503c\uff0c\u5982\u7528\u4e8e\u8ba1\u7b97\u3001\u4f5c\u4e3a\u67e5\u8be2\u7ed3\u679c\u7684\u4e00\u90e8\u5206\u6216\u4f5c\u4e3a\u6761\u4ef6\u6bd4\u8f83\u7684\u4e00\u90e8\u5206\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u9ad8\u7ea7\u5b50\u67e5\u8be2\u3001\u5d4c\u5957\u5b50\u67e5\u8be2\u3001\u76f8\u5173\u5b50\u67e5\u8be2\u3001\u666e\u901a\u5b50\u67e5\u8be2\u7684\u533a\u522b\u662f\uff1a\u9ad8\u7ea7\u5b50\u67e5\u8be2\u548c\u76f8\u5173\u5b50\u67e5\u8be2\u662f\u5b58\u5728\u5173\u8054\u5173\u7cfb\u7684\u5b50\u67e5\u8be2\u5f62\u5f0f\uff0c\u800c\u5d4c [&hellip;]","protected":false},"author":1,"featured_media":32803,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[537],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/32799"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=32799"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/32799\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/32803"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=32799"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=32799"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=32799"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}