{"id":175401,"date":"2024-11-08T05:34:19","date_gmt":"2024-11-07T21:34:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/175401\/"},"modified":"2024-11-08T05:34:20","modified_gmt":"2024-11-07T21:34:20","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8sql-server%e6%95%b8%e6%93%9a%e5%ba%ab%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%a9%a2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/175401\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528SQL Server\u6578\u64da\u5eab\u5d4c\u5957\u5b50\u67e5\u8a62"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8sql-server%e6%95%b8%e6%93%9a%e5%ba%ab%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%a9%a2-xxVnfSINQp\">\u5982\u4f55\u4f7f\u7528SQL Server\u6578\u64da\u5eab\u5d4c\u5957\u5b50\u67e5\u8a62<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL 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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-xxVnfSINQp\">\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\u5305\u542b\u53e6\u4e00\u500b\u67e5\u8a62\u3002\u9019\u7a2e\u67e5\u8a62\u53ef\u4ee5\u7528\u65bc\u591a\u7a2e\u60c5\u6cc1\uff0c\u4f8b\u5982\u904e\u6ffe\u6578\u64da\u3001\u8a08\u7b97\u805a\u5408\u503c\u6216\u5f9e\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u5d4c\u5957\u5b50\u67e5\u8a62\u901a\u5e38\u5206\u70ba\u5169\u7a2e\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u6a19\u91cf\u5b50\u67e5\u8a62\uff1a<\/strong>\u8fd4\u56de\u55ae\u4e00\u503c\u7684\u5b50\u67e5\u8a62\u3002<\/li>\n<li><strong>\u8868\u9054\u5f0f\u5b50\u67e5\u8a62\uff1a<\/strong>\u8fd4\u56de\u591a\u884c\u6216\u591a\u5217\u7684\u5b50\u67e5\u8a62\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%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-xxVnfSINQp\">\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>\nSELECT column1, column2, \n    (SELECT aggregate_function(column) \n     FROM table_name \n     WHERE condition) AS alias_name\nFROM main_table\nWHERE condition;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u8a9e\u6cd5\u4e2d\uff0c\u5167\u90e8\u7684SELECT\u8a9e\u53e5\u662f\u5b50\u67e5\u8a62\uff0c\u5916\u90e8\u7684SELECT\u8a9e\u53e5\u662f\u4e3b\u67e5\u8a62\u3002\u5b50\u67e5\u8a62\u7684\u7d50\u679c\u53ef\u4ee5\u7528\u65bc\u4e3b\u67e5\u8a62\u7684\u904e\u6ffe\u6216\u8a08\u7b97\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%af%a6%e9%9a%9b%e7%a4%ba%e4%be%8b-xxVnfSINQp\">\u4f7f\u7528\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u5be6\u969b\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\uff1a<code>Employees<\/code>\u548c<code>Departments<\/code>\u3002<code>Employees<\/code>\u8868\u5305\u542b\u54e1\u5de5\u7684\u8a73\u7d30\u4fe1\u606f\uff0c\u800c<code>Departments<\/code>\u8868\u5305\u542b\u90e8\u9580\u7684\u4fe1\u606f\u3002\u6211\u5011\u5e0c\u671b\u67e5\u8a62\u6240\u6709\u5728\u7279\u5b9a\u90e8\u9580\u5de5\u4f5c\u7684\u54e1\u5de5\uff0c\u4e26\u986f\u793a\u4ed6\u5011\u7684\u59d3\u540d\u548c\u90e8\u9580\u540d\u7a31\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4f7f\u7528\u5d4c\u5957\u5b50\u67e5\u8a62\u7684SQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>\nSELECT e.Name, \n       (SELECT d.DepartmentName \n        FROM Departments d \n        WHERE d.DepartmentID = e.DepartmentID) AS DepartmentName\nFROM Employees e\nWHERE e.DepartmentID IN (SELECT DepartmentID \n                          FROM Departments \n                          WHERE Location = 'Hong Kong');\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5167\u90e8\u7684\u5b50\u67e5\u8a62\u7528\u65bc\u7372\u53d6\u90e8\u9580\u540d\u7a31\uff0c\u800c\u5916\u90e8\u67e5\u8a62\u5247\u7528\u65bc\u7372\u53d6\u54e1\u5de5\u7684\u59d3\u540d\u3002\u9019\u6a23\uff0c\u6211\u5011\u5c31\u80fd\u5920\u7372\u5f97\u5728\u9999\u6e2f\u5730\u5340\u5de5\u4f5c\u7684\u6240\u6709\u54e1\u5de5\u53ca\u5176\u6240\u5c6c\u90e8\u9580\u7684\u8a73\u7d30\u4fe1\u606f\u3002<\/p>\n<h2 id=\"%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-xxVnfSINQp\">\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u6027\u80fd\u8003\u91cf<\/h2>\n<p>\u96d6\u7136\u5d4c\u5957\u5b50\u67e5\u8a62\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5b83\u5011\u4e5f\u53ef\u80fd\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\u3002\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u5d4c\u5957\u5b50\u67e5\u8a62\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u70ba\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528JOIN\u4ee3\u66ff\u5d4c\u5957\u5b50\u67e5\u8a62\uff1a\u5728\u8a31\u591a\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528JOIN\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li>\u78ba\u4fdd\u7d22\u5f15\u7684\u4f7f\u7528\uff1a\u70ba\u76f8\u95dc\u7684\u5217\u5275\u5efa\u7d22\u5f15\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002<\/li>\n<li>\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5b50\u67e5\u8a62\uff1a\u50c5\u5728\u9700\u8981\u6642\u4f7f\u7528\u5d4c\u5957\u5b50\u67e5\u8a62\uff0c\u7c21\u5316\u67e5\u8a62\u7d50\u69cb\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-xxVnfSINQp\">\u7e3d\u7d50<\/h2>\n<p>\u5d4c\u5957\u5b50\u67e5\u8a62\u662fSQL Server\u4e2d\u4e00\u7a2e\u5f37\u5927\u7684\u67e5\u8a62\u6280\u8853\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u548c\u904e\u6ffe\u6578\u64da\u3002\u901a\u904e\u7406\u89e3\u5176\u57fa\u672c\u8a9e\u6cd5\u548c\u4f7f\u7528\u5834\u666f\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u5229\u7528\u9019\u4e00\u529f\u80fd\u4f86\u6eff\u8db3\u696d\u52d9\u9700\u6c42\u3002\u5728\u9078\u64c7\u4f7f\u7528\u5d4c\u5957\u5b50\u67e5\u8a62\u6642\uff0c\u9084\u9700\u8003\u616e\u6027\u80fd\u554f\u984c\uff0c\u4e26\u6839\u64da\u5177\u9ad4\u60c5\u6cc1\u9078\u64c7\u6700\u5408\u9069\u7684\u67e5\u8a62\u65b9\u5f0f\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684SQL Server\u6578\u64da\u5eab\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u7a69\u5b9a\u548c\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728SQL 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