{"id":144083,"date":"2024-11-01T05:06:28","date_gmt":"2024-10-31T21:06:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/144083\/"},"modified":"2024-11-01T05:06:29","modified_gmt":"2024-10-31T21:06:29","slug":"sql-%e4%b8%ad-exists-%e5%92%8c-any-%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%8d%80%e5%88%a5%e5%af%a6%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/144083\/","title":{"rendered":"SQL \u4e2d EXISTS \u548c = ANY \u67e5\u8a62\u7684\u5340\u5225\u5be6\u4f8b"},"content":{"rendered":"<h1 id=\"sql-%e4%b8%ad-exists-%e5%92%8c-any-%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%8d%80%e5%88%a5%e5%af%a6%e4%be%8b-ehKWJQbRSo\">SQL \u4e2d EXISTS \u548c = ANY \u67e5\u8a62\u7684\u5340\u5225\u5be6\u4f8b<\/h1>\n<p>\u5728 SQL \u4e2d\uff0c\u67e5\u8a62\u7684\u6548\u7387\u548c\u6b63\u78ba\u6027\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u7576\u6211\u5011\u9700\u8981\u6aa2\u67e5\u67d0\u500b\u689d\u4ef6\u662f\u5426\u5b58\u5728\u65bc\u5b50\u67e5\u8a62\u7684\u7d50\u679c\u4e2d\u6642\uff0c\u901a\u5e38\u6703\u4f7f\u7528 <code>EXISTS<\/code> \u548c <code>= ANY<\/code> \u9019\u5169\u7a2e\u65b9\u6cd5\u3002\u96d6\u7136\u5b83\u5011\u7684\u529f\u80fd\u76f8\u4f3c\uff0c\u4f46\u5728\u4f7f\u7528\u4e0a\u537b\u6709\u8457\u660e\u986f\u7684\u5340\u5225\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u5169\u8005\u7684\u5dee\u7570\uff0c\u4e26\u63d0\u4f9b\u5be6\u4f8b\u4ee5\u5e6b\u52a9\u7406\u89e3\u3002<\/p>\n<h2 id=\"exists-%e7%9a%84%e4%bd%bf%e7%94%a8-ehKWJQbRSo\">EXISTS \u7684\u4f7f\u7528<\/h2>\n<p><code>EXISTS<\/code> \u662f\u4e00\u500b\u5e03\u6797\u904b\u7b97\u7b26\uff0c\u7528\u65bc\u6aa2\u67e5\u5b50\u67e5\u8a62\u662f\u5426\u8fd4\u56de\u4efb\u4f55\u884c\u3002\u7576\u5b50\u67e5\u8a62\u8fd4\u56de\u81f3\u5c11\u4e00\u884c\u6642\uff0c<code>EXISTS<\/code> \u8fd4\u56de <code>TRUE<\/code>\uff0c\u5426\u5247\u8fd4\u56de <code>FALSE<\/code>\u3002\u9019\u4f7f\u5f97 <code>EXISTS<\/code> \u7279\u5225\u9069\u5408\u7528\u65bc\u6aa2\u67e5\u67d0\u500b\u689d\u4ef6\u662f\u5426\u5b58\u5728\u3002<\/p>\n<h3 id=\"exists-%e7%9a%84%e7%af%84%e4%be%8b-ehKWJQbRSo\">EXISTS \u7684\u7bc4\u4f8b<\/h3>\n<pre><code>SELECT employee_id, employee_name\nFROM employees e\nWHERE EXISTS (\n    SELECT 1\n    FROM departments d\n    WHERE d.department_id = e.department_id AND d.location = 'Hong Kong'\n);\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u67e5\u8a62\u6240\u6709\u5728\u300c\u9999\u6e2f\u300d\u5730\u5340\u5de5\u4f5c\u7684\u54e1\u5de5\u3002<code>EXISTS<\/code> \u5b50\u67e5\u8a62\u6aa2\u67e5\u662f\u5426\u5b58\u5728\u8207\u54e1\u5de5\u90e8\u9580 ID \u76f8\u5339\u914d\u4e14\u4f4d\u65bc\u300c\u9999\u6e2f\u300d\u7684\u90e8\u9580\u3002\u5982\u679c\u5b58\u5728\uff0c\u5247\u8a72\u54e1\u5de5\u7684\u8cc7\u6599\u5c07\u88ab\u8fd4\u56de\u3002<\/p>\n<h2 id=\"any-%e7%9a%84%e4%bd%bf%e7%94%a8-ehKWJQbRSo\">= ANY \u7684\u4f7f\u7528<\/h2>\n<p><code>= ANY<\/code> \u662f\u4e00\u500b\u6bd4\u8f03\u904b\u7b97\u7b26\uff0c\u7528\u65bc\u6aa2\u67e5\u67d0\u500b\u503c\u662f\u5426\u7b49\u65bc\u5b50\u67e5\u8a62\u8fd4\u56de\u7684\u4efb\u4f55\u4e00\u500b\u503c\u3002\u9019\u610f\u5473\u8457\u5982\u679c\u5b50\u67e5\u8a62\u8fd4\u56de\u7684\u4efb\u4f55\u4e00\u500b\u503c\u8207\u4e3b\u67e5\u8a62\u4e2d\u7684\u503c\u76f8\u7b49\uff0c\u5247\u689d\u4ef6\u6210\u7acb\u3002<\/p>\n<h3 id=\"any-%e7%9a%84%e7%af%84%e4%be%8b-ehKWJQbRSo\">= ANY \u7684\u7bc4\u4f8b<\/h3>\n<pre><code>SELECT employee_id, employee_name\nFROM employees\nWHERE department_id = ANY (\n    SELECT department_id\n    FROM departments\n    WHERE location = 'Hong Kong'\n);\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u67e5\u8a62\u6240\u6709\u90e8\u9580 ID \u5728\u300c\u9999\u6e2f\u300d\u5730\u5340\u7684\u54e1\u5de5\u3002<code>= ANY<\/code> \u5b50\u67e5\u8a62\u8fd4\u56de\u6240\u6709\u4f4d\u65bc\u300c\u9999\u6e2f\u300d\u7684\u90e8\u9580 ID\uff0c\u7136\u5f8c\u4e3b\u67e5\u8a62\u6aa2\u67e5\u54e1\u5de5\u7684\u90e8\u9580 ID \u662f\u5426\u8207\u9019\u4e9b ID \u4e2d\u7684\u4efb\u4f55\u4e00\u500b\u76f8\u7b49\u3002<\/p>\n<h2 id=\"exists-%e8%88%87-any-%e7%9a%84%e4%b8%bb%e8%a6%81%e5%8d%80%e5%88%a5-ehKWJQbRSo\">EXISTS \u8207 = ANY \u7684\u4e3b\u8981\u5340\u5225<\/h2>\n<ul>\n<li><strong>\u8fd4\u56de\u503c\uff1a<\/strong> <code>EXISTS<\/code> \u8fd4\u56de\u5e03\u6797\u503c\uff0c\u800c <code>= ANY<\/code> \u8fd4\u56de\u8207\u4e3b\u67e5\u8a62\u7684\u503c\u9032\u884c\u6bd4\u8f03\u7684\u7d50\u679c\u3002<\/li>\n<li><strong>\u6027\u80fd\uff1a<\/strong> \u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c<code>EXISTS<\/code> \u53ef\u80fd\u6703\u6bd4 <code>= ANY<\/code> \u66f4\u9ad8\u6548\uff0c\u56e0\u70ba\u4e00\u65e6\u627e\u5230\u5339\u914d\u7684\u884c\uff0c<code>EXISTS<\/code> \u5c31\u6703\u505c\u6b62\u641c\u7d22\uff0c\u800c <code>= ANY<\/code> \u9700\u8981\u6bd4\u8f03\u6240\u6709\u8fd4\u56de\u7684\u503c\u3002<\/li>\n<li><strong>\u7528\u6cd5\u5834\u666f\uff1a<\/strong> <code>EXISTS<\/code> \u66f4\u9069\u5408\u7528\u65bc\u6aa2\u67e5\u662f\u5426\u5b58\u5728\u67d0\u4e9b\u689d\u4ef6\uff0c\u800c <code>= ANY<\/code> \u66f4\u9069\u5408\u7528\u65bc\u9700\u8981\u6bd4\u8f03\u5177\u9ad4\u503c\u7684\u60c5\u6cc1\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ehKWJQbRSo\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL \u67e5\u8a62\u4e2d\uff0c<code>EXISTS<\/code> \u548c <code>= ANY<\/code> \u90fd\u662f\u7528\u65bc\u8655\u7406\u5b50\u67e5\u8a62\u7684\u6709\u529b\u5de5\u5177\u3002\u9078\u64c7\u4f7f\u7528\u54ea\u4e00\u7a2e\u65b9\u6cd5\u53d6\u6c7a\u65bc\u5177\u9ad4\u7684\u9700\u6c42\u548c\u67e5\u8a62\u7684\u4e0a\u4e0b\u6587\u3002\u4e86\u89e3\u5b83\u5011\u4e4b\u9593\u7684\u5340\u5225\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u7de8\u5beb\u67e5\u8a62\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a> \u670d\u52d9\u80fd\u5920\u652f\u6301\u5404\u7a2e\u61c9\u7528\uff0c\u7121\u8ad6\u662f\u5c0f\u578b\u7db2\u7ad9\u9084\u662f\u5927\u578b\u4f01\u696d\u7cfb\u7d71\uff0c\u5747\u80fd\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u5b89\u5168\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3 SQL \u4e2d EXISTS \u548c = ANY \u7684\u67e5\u8a62\u5340\u5225\uff0c\u901a\u904e\u5be6\u4f8b\u6df1\u5165\u89e3\u6790\u5176\u7528\u6cd5\u548c\u6027\u80fd\u5dee\u7570\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-144083","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144083","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=144083"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144083\/revisions"}],"predecessor-version":[{"id":144084,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144083\/revisions\/144084"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=144083"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=144083"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=144083"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}