{"id":138973,"date":"2024-10-31T17:09:22","date_gmt":"2024-10-31T09:09:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/138973\/"},"modified":"2024-10-31T17:09:22","modified_gmt":"2024-10-31T09:09:22","slug":"sql-server%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e7%8d%a8%e7%89%b9%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/138973\/","title":{"rendered":"SQL Server\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u7368\u7279\u529f\u80fd"},"content":{"rendered":"<h1 id=\"sql-server%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e7%8d%a8%e7%89%b9%e5%8a%9f%e8%83%bd-aYhPrguzTL\">SQL Server\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u7368\u7279\u529f\u80fd<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL Server\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u67e5\u8a62\u529f\u80fd\uff0c\u5176\u4e2d\u5d4c\u5957\u5b50\u67e5\u8a62\uff08Nested Subquery\uff09\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u5f9e\u8cc7\u6599\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0eSQL Server\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u7368\u7279\u529f\u80fd\u53ca\u5176\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%a9%a2%ef%bc%9f-aYhPrguzTL\">\u4ec0\u9ebc\u662f\u5d4c\u5957\u5b50\u67e5\u8a62\uff1f<\/h2>\n<p>\u5d4c\u5957\u5b50\u67e5\u8a62\u662f\u6307\u5728\u4e00\u500bSQL\u67e5\u8a62\u4e2d\u5d4c\u5165\u53e6\u4e00\u500b\u67e5\u8a62\u3002\u9019\u7a2e\u67e5\u8a62\u7d50\u69cb\u5141\u8a31\u958b\u767c\u8005\u5728\u4e3b\u67e5\u8a62\u4e2d\u4f7f\u7528\u5b50\u67e5\u8a62\u7684\u7d50\u679c\uff0c\u5f9e\u800c\u5be6\u73fe\u66f4\u8907\u96dc\u7684\u6578\u64da\u6aa2\u7d22\u3002\u5d4c\u5957\u5b50\u67e5\u8a62\u53ef\u4ee5\u51fa\u73fe\u5728SELECT\u3001INSERT\u3001UPDATE\u6216DELETE\u8a9e\u53e5\u4e2d\uff0c\u4e26\u4e14\u53ef\u4ee5\u7528\u65bcWHERE\u3001FROM\u6216SELECT\u5b50\u53e5\u4e2d\u3002<\/p>\n<h2 id=\"%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e9%a1%9e%e5%9e%8b-aYhPrguzTL\">\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u985e\u578b<\/h2>\n<ul>\n<li><strong>\u55ae\u884c\u5b50\u67e5\u8a62\uff1a<\/strong>\u8fd4\u56de\u55ae\u4e00\u884c\u7684\u7d50\u679c\uff0c\u901a\u5e38\u7528\u65bc\u6bd4\u8f03\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u591a\u884c\u5b50\u67e5\u8a62\uff1a<\/strong>\u8fd4\u56de\u591a\u884c\u7684\u7d50\u679c\uff0c\u901a\u5e38\u7528\u65bcIN\u6216EXISTS\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u76f8\u95dc\u5b50\u67e5\u8a62\uff1a<\/strong>\u5b50\u67e5\u8a62\u4f9d\u8cf4\u65bc\u5916\u90e8\u67e5\u8a62\u7684\u7d50\u679c\uff0c\u901a\u5e38\u7528\u65bc\u66f4\u8907\u96dc\u7684\u689d\u4ef6\u7be9\u9078\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%84%aa%e5%8b%a2-aYhPrguzTL\">\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u512a\u52e2<\/h2>\n<p>\u4f7f\u7528\u5d4c\u5957\u5b50\u67e5\u8a62\u6709\u5e7e\u500b\u660e\u986f\u7684\u512a\u52e2\uff1a<\/p>\n<ul>\n<li><strong>\u63d0\u9ad8\u53ef\u8b80\u6027\uff1a<\/strong>\u5c07\u8907\u96dc\u7684\u67e5\u8a62\u5206\u89e3\u70ba\u66f4\u5c0f\u7684\u90e8\u5206\uff0c\u4f7f\u5f97\u67e5\u8a62\u66f4\u6613\u65bc\u7406\u89e3\u548c\u7dad\u8b77\u3002<\/li>\n<li><strong>\u9748\u6d3b\u6027\uff1a<\/strong>\u80fd\u5920\u6839\u64da\u4e0d\u540c\u7684\u689d\u4ef6\u52d5\u614b\u751f\u6210\u67e5\u8a62\u7d50\u679c\uff0c\u9069\u61c9\u4e0d\u540c\u7684\u696d\u52d9\u9700\u6c42\u3002<\/li>\n<li><strong>\u6578\u64da\u7be9\u9078\uff1a<\/strong>\u80fd\u5920\u5728\u4e3b\u67e5\u8a62\u4e2d\u4f7f\u7528\u5b50\u67e5\u8a62\u7684\u7d50\u679c\u9032\u884c\u66f4\u7cbe\u78ba\u7684\u6578\u64da\u7be9\u9078\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e7%af%84%e4%be%8b-aYhPrguzTL\">\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528\u5d4c\u5957\u5b50\u67e5\u8a62\u4f86\u67e5\u8a62\u54e1\u5de5\u7684\u8cc7\u6599\uff1a<\/p>\n<pre><code>SELECT EmployeeID, EmployeeName\nFROM Employees\nWHERE DepartmentID IN (SELECT DepartmentID\n                       FROM Departments\n                       WHERE Location = 'Hong Kong');<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u4e3b\u67e5\u8a62\u5f9eEmployees\u8868\u4e2d\u9078\u64c7\u54e1\u5de5ID\u548c\u59d3\u540d\uff0c\u800c\u5b50\u67e5\u8a62\u5247\u5f9eDepartments\u8868\u4e2d\u9078\u64c7\u4f4d\u65bc\u9999\u6e2f\u7684\u90e8\u9580ID\u3002\u9019\u6a23\uff0c\u53ea\u6709\u5728\u9999\u6e2f\u7684\u90e8\u9580\u4e2d\u7684\u54e1\u5de5\u624d\u6703\u88ab\u9078\u4e2d\u3002<\/p>\n<h2 id=\"%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-aYhPrguzTL\">\u6027\u80fd\u8003\u91cf<\/h2>\n<p>\u96d6\u7136\u5d4c\u5957\u5b50\u67e5\u8a62\u63d0\u4f9b\u4e86\u9748\u6d3b\u6027\u548c\u53ef\u8b80\u6027\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u5b83\u5011\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\u3002\u7279\u5225\u662f\u7576\u5b50\u67e5\u8a62\u8fd4\u56de\u5927\u91cf\u6578\u64da\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u4e3b\u67e5\u8a62\u7684\u57f7\u884c\u901f\u5ea6\u8b8a\u6162\u3002\u56e0\u6b64\uff0c\u5728\u8a2d\u8a08\u67e5\u8a62\u6642\uff0c\u958b\u767c\u8005\u61c9\u8a72\u8003\u616e\u4f7f\u7528JOIN\u64cd\u4f5c\u4f86\u66ff\u4ee3\u67d0\u4e9b\u5d4c\u5957\u5b50\u67e5\u8a62\uff0c\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-aYhPrguzTL\">\u7d50\u8ad6<\/h2>\n<p>SQL Server\u7684\u5d4c\u5957\u5b50\u67e5\u8a62\u662f\u4e00\u500b\u5f37\u5927\u7684\u529f\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u9748\u6d3b\u5730\u5f9e\u8cc7\u6599\u5eab\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u5d4c\u5957\u5b50\u67e5\u8a62\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u53ef\u8b80\u6027\u548c\u9748\u6d3b\u6027\uff0c\u4e26\u6839\u64da\u696d\u52d9\u9700\u6c42\u9032\u884c\u7cbe\u78ba\u7684\u6578\u64da\u7be9\u9078\u3002\u7136\u800c\uff0c\u958b\u767c\u8005\u4e5f\u61c9\u8a72\u6ce8\u610f\u67e5\u8a62\u6027\u80fd\uff0c\u6839\u64da\u5177\u9ad4\u60c5\u6cc1\u9078\u64c7\u6700\u5408\u9069\u7684\u67e5\u8a62\u65b9\u5f0f\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc<code>VPS<\/code>\u3001<code>\u9999\u6e2fvps<\/code>\u53ca\u5176\u4ed6<code>\u4f3a\u670d\u5668<\/code>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a 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Server\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u7368\u7279\u529f\u80fd\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u6578\u64da\u5206\u6790\u6d41\u7a0b\uff0c\u5be6\u73fe\u66f4\u9748\u6d3b\u7684\u6578\u64da\u64cd\u4f5c\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-138973","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138973","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=138973"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138973\/revisions"}],"predecessor-version":[{"id":138974,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138973\/revisions\/138974"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=138973"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=138973"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=138973"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}