{"id":138975,"date":"2024-10-31T17:10:18","date_gmt":"2024-10-31T09:10:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/138975\/"},"modified":"2024-10-31T17:10:19","modified_gmt":"2024-10-31T09:10:19","slug":"sql-server%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%ad%a3%e7%a2%ba%e6%87%89%e7%94%a8%e7%a8%8b%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/138975\/","title":{"rendered":"SQL Server\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u6b63\u78ba\u61c9\u7528\u7a0b\u5e8f"},"content":{"rendered":"<h1 id=\"sql-server%e5%b5%8c%e5%a5%97%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%ad%a3%e7%a2%ba%e6%87%89%e7%94%a8%e7%a8%8b%e5%ba%8f-biFvUuHaFw\">SQL Server\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u6b63\u78ba\u61c9\u7528\u7a0b\u5e8f<\/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\u65b9\u5f0f\u4f86\u7372\u53d6\u548c\u64cd\u4f5c\u8cc7\u6599\uff0c\u5176\u4e2d\u5d4c\u5957\u5b50\u67e5\u8a62\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\u3002\u672c\u6587\u5c07\u63a2\u8a0eSQL Server\u4e2d\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u6b63\u78ba\u61c9\u7528\u7a0b\u5e8f\uff0c\u4e26\u63d0\u4f9b\u5be6\u7528\u7684\u7bc4\u4f8b\u548c\u5efa\u8b70\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-biFvUuHaFw\">\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\u53ef\u4ee5\u7528\u65bc\u5f9e\u8cc7\u6599\u5eab\u4e2d\u6aa2\u7d22\u8cc7\u6599\uff0c\u4e26\u4e14\u53ef\u4ee5\u5728\u4e3b\u67e5\u8a62\u4e2d\u4f7f\u7528\u5b50\u67e5\u8a62\u7684\u7d50\u679c\u3002\u5d4c\u5957\u5b50\u67e5\u8a62\u901a\u5e38\u7528\u65bc\u9700\u8981\u6839\u64da\u5176\u4ed6\u67e5\u8a62\u7684\u7d50\u679c\u4f86\u904e\u6ffe\u6216\u8a08\u7b97\u8cc7\u6599\u7684\u60c5\u6cc1\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-biFvUuHaFw\">\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u985e\u578b<\/h2>\n<ul>\n<li><strong>\u6a19\u91cf\u5b50\u67e5\u8a62\uff1a<\/strong>\u8fd4\u56de\u55ae\u4e00\u503c\u7684\u5b50\u67e5\u8a62\uff0c\u901a\u5e38\u7528\u65bcWHERE\u6216SELECT\u5b50\u53e5\u4e2d\u3002<\/li>\n<li><strong>\u884c\u5b50\u67e5\u8a62\uff1a<\/strong>\u8fd4\u56de\u4e00\u884c\u8cc7\u6599\u7684\u5b50\u67e5\u8a62\uff0c\u901a\u5e38\u7528\u65bcWHERE\u5b50\u53e5\u4e2d\u3002<\/li>\n<li><strong>\u8868\u5b50\u67e5\u8a62\uff1a<\/strong>\u8fd4\u56de\u591a\u884c\u591a\u5217\u7684\u8cc7\u6599\uff0c\u901a\u5e38\u7528\u65bcFROM\u5b50\u53e5\u4e2d\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%e6%ad%a3%e7%a2%ba%e6%87%89%e7%94%a8-biFvUuHaFw\">\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u6b63\u78ba\u61c9\u7528<\/h2>\n<p>\u5728\u4f7f\u7528\u5d4c\u5957\u5b50\u67e5\u8a62\u6642\uff0c\u61c9\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<h3 id=\"1-%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-biFvUuHaFw\">1. \u6027\u80fd\u8003\u91cf<\/h3>\n<p>\u5d4c\u5957\u5b50\u67e5\u8a62\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u8cc7\u6599\u6642\u3002\u70ba\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528JOIN\u64cd\u4f5c\u4f86\u66ff\u4ee3\u5d4c\u5957\u5b50\u67e5\u8a62\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT EmployeeID, Name \nFROM Employees \nWHERE DepartmentID IN (SELECT DepartmentID FROM Departments WHERE Location = 'Hong Kong');<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8a62\u4f7f\u7528\u4e86\u5d4c\u5957\u5b50\u67e5\u8a62\u4f86\u7372\u53d6\u5728\u9999\u6e2f\u7684\u90e8\u9580ID\uff0c\u4f46\u53ef\u4ee5\u4f7f\u7528JOIN\u4f86\u63d0\u9ad8\u6548\u7387\uff1a<\/p>\n<pre><code>SELECT e.EmployeeID, e.Name \nFROM Employees e\nJOIN Departments d ON e.DepartmentID = d.DepartmentID \nWHERE d.Location = 'Hong Kong';<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e6%a8%99%e9%87%8f%e5%ad%90%e6%9f%a5%e8%a9%a2-biFvUuHaFw\">2. \u4f7f\u7528\u6a19\u91cf\u5b50\u67e5\u8a62<\/h3>\n<p>\u6a19\u91cf\u5b50\u67e5\u8a62\u53ef\u4ee5\u7528\u65bc\u8a08\u7b97\u67d0\u500b\u503c\uff0c\u4f8b\u5982\u8a08\u7b97\u6bcf\u4f4d\u54e1\u5de5\u7684\u85aa\u6c34\u8207\u5176\u90e8\u9580\u7684\u5e73\u5747\u85aa\u6c34\u4e4b\u9593\u7684\u5dee\u7570\uff1a<\/p>\n<pre><code>SELECT Name, Salary, \n       (SELECT AVG(Salary) FROM Employees WHERE DepartmentID = e.DepartmentID) AS AvgSalary\nFROM Employees e;<\/code><\/pre>\n<h3 id=\"3-%e9%81%a9%e7%95%b6%e4%bd%bf%e7%94%a8%e8%a1%a8%e5%ad%90%e6%9f%a5%e8%a9%a2-biFvUuHaFw\">3. \u9069\u7576\u4f7f\u7528\u8868\u5b50\u67e5\u8a62<\/h3>\n<p>\u8868\u5b50\u67e5\u8a62\u53ef\u4ee5\u7528\u65bc\u5f9e\u591a\u500b\u8868\u4e2d\u7372\u53d6\u8cc7\u6599\u3002\u4f8b\u5982\uff0c\u7372\u53d6\u6240\u6709\u54e1\u5de5\u53ca\u5176\u6240\u5c6c\u90e8\u9580\u7684\u8a73\u7d30\u8cc7\u8a0a\uff1a<\/p>\n<pre><code>SELECT e.Name, d.DepartmentName \nFROM Employees e\nJOIN (SELECT DepartmentID, DepartmentName FROM Departments) d ON e.DepartmentID = d.DepartmentID;<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-biFvUuHaFw\">\u7d50\u8ad6<\/h2>\n<p>\u5d4c\u5957\u5b50\u67e5\u8a62\u5728SQL Server\u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5f9e\u8cc7\u6599\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u8cc7\u6599\u3002\u7136\u800c\uff0c\u4f7f\u7528\u6642\u9700\u8b39\u614e\u8003\u91cf\u6027\u80fd\u554f\u984c\uff0c\u4e26\u6839\u64da\u5177\u9ad4\u60c5\u6cc1\u9078\u64c7\u5408\u9069\u7684\u67e5\u8a62\u65b9\u5f0f\u3002\u900f\u904e\u5408\u7406\u7684\u8a2d\u8a08\u548c\u512a\u5316\uff0c\u5d4c\u5957\u5b50\u67e5\u8a62\u53ef\u4ee5\u6709\u6548\u63d0\u5347\u8cc7\u6599\u6aa2\u7d22\u7684\u9748\u6d3b\u6027\u548c\u6548\u7387\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3\u6709\u95dc<code>VPS<\/code>\u3001<code>\u9999\u6e2fvps<\/code>\u53ca\u5176\u4ed6<code>\u4f3a\u670d\u5668<\/code>\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22SQL Server\u4e2d\u5d4c\u5957\u5b50\u67e5\u8a62\u7684\u6b63\u78ba\u61c9\u7528\u7a0b\u5e8f\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u8207\u6578\u64da\u8655\u7406\u80fd\u529b\uff0c\u5be6\u73fe\u66f4\u7cbe\u78ba\u7684\u6578\u64da\u5206\u6790\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-138975","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138975","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=138975"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138975\/revisions"}],"predecessor-version":[{"id":138976,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138975\/revisions\/138976"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=138975"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=138975"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=138975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}