{"id":154517,"date":"2024-11-02T16:28:22","date_gmt":"2024-11-02T08:28:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/154517\/"},"modified":"2024-11-02T16:28:23","modified_gmt":"2024-11-02T08:28:23","slug":"%e5%b0%8d-ms-sql-server-%e5%87%bd%e6%95%b8%e7%9a%84%e5%85%a9%e7%a8%ae%e5%af%a6%e9%9a%9b%e7%94%a8%e6%b3%95%e7%9a%84%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/154517\/","title":{"rendered":"\u5c0d MS SQL Server \u51fd\u6578\u7684\u5169\u7a2e\u5be6\u969b\u7528\u6cd5\u7684\u5206\u6790"},"content":{"rendered":"

\u5c0d MS SQL Server \u51fd\u6578\u7684\u5169\u7a2e\u5be6\u969b\u7528\u6cd5\u7684\u5206\u6790<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMS SQL Server \u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u652f\u6301\u6578\u64da\u7684\u5b58\u5132\u3001\u6aa2\u7d22\u548c\u7ba1\u7406\u3002\u5176\u4e2d\uff0c\u51fd\u6578\u662f MS SQL Server \u7684\u4e00\u500b\u91cd\u8981\u7d44\u4ef6\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u7c21\u5316\u8907\u96dc\u7684\u67e5\u8a62\u548c\u6578\u64da\u8655\u7406\u3002\u672c\u6587\u5c07\u5206\u6790 MS SQL Server \u51fd\u6578\u7684\u5169\u7a2e\u5be6\u969b\u7528\u6cd5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n

\u4e00\u3001\u7528\u65bc\u6578\u64da\u8a08\u7b97\u7684\u51fd\u6578<\/h2>\n

\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u5c0d\u6578\u64da\u9032\u884c\u8a08\u7b97\u548c\u7d71\u8a08\u3002MS SQL Server \u63d0\u4f9b\u4e86\u591a\u7a2e\u5167\u5efa\u51fd\u6578\u4f86\u652f\u6301\u9019\u4e9b\u64cd\u4f5c\uff0c\u4f8b\u5982\u805a\u5408\u51fd\u6578\u548c\u6578\u5b78\u51fd\u6578\u3002<\/p>\n

1. \u805a\u5408\u51fd\u6578<\/h3>\n

\u805a\u5408\u51fd\u6578\u662f\u7528\u65bc\u8a08\u7b97\u4e00\u7d44\u503c\u7684\u55ae\u4e00\u503c\u7684\u51fd\u6578\u3002\u5e38\u898b\u7684\u805a\u5408\u51fd\u6578\u5305\u62ec SUM()<\/code>\u3001AVG()<\/code>\u3001COUNT()<\/code> \u7b49\u3002\u9019\u4e9b\u51fd\u6578\u5728\u5831\u544a\u548c\u6578\u64da\u5206\u6790\u4e2d\u975e\u5e38\u6709\u7528\u3002<\/p>\n

SELECT \n    Department, \n    COUNT(*) AS EmployeeCount, \n    AVG(Salary) AS AverageSalary \nFROM \n    Employees \nGROUP BY \n    Department;<\/code><\/pre>\n
\u5728\u4e0a\u8ff0\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86 COUNT()<\/code> \u51fd\u6578\u4f86\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u7684\u54e1\u5de5\u6578\u91cf\uff0c\u4e26\u4f7f\u7528 AVG()<\/code> \u51fd\u6578\u4f86\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u7684\u5e73\u5747\u85aa\u8cc7\u3002\u9019\u6a23\u7684\u67e5\u8a62\u80fd\u5920\u5e6b\u52a9\u7ba1\u7406\u5c64\u5feb\u901f\u4e86\u89e3\u5404\u90e8\u9580\u7684\u54e1\u5de5\u5206\u4f48\u548c\u85aa\u8cc7\u60c5\u6cc1\u3002<\/p>\n
2. \u6578\u5b78\u51fd\u6578<\/h3>\n
\u9664\u4e86\u805a\u5408\u51fd\u6578\uff0cMS SQL Server \u9084\u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u5b78\u51fd\u6578\uff0c\u4f8b\u5982 ROUND()<\/code>\u3001CEILING()<\/code> \u548c FLOOR()<\/code> \u7b49\u3002\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u6578\u64da\u7684\u7cbe\u78ba\u8a08\u7b97\u3002<\/p>\n
SELECT \n    ProductName, \n    Price, \n    ROUND(Price * 1.1, 2) AS PriceWithTax \nFROM \n    Products;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 ROUND()<\/code> \u51fd\u6578\u4f86\u8a08\u7b97\u7522\u54c1\u50f9\u683c\u52a0\u4e0a\u7a05\u91d1\u5f8c\u7684\u91d1\u984d\uff0c\u4e26\u5c07\u7d50\u679c\u56db\u6368\u4e94\u5165\u5230\u5c0f\u6578\u9ede\u5f8c\u5169\u4f4d\u3002\u9019\u5c0d\u65bc\u8a08\u7b97\u6700\u7d42\u92b7\u552e\u50f9\u683c\u975e\u5e38\u91cd\u8981\u3002<\/p>\n
\u4e8c\u3001\u7528\u65bc\u6578\u64da\u8f49\u63db\u7684\u51fd\u6578<\/h2>\n
\u6578\u64da\u8f49\u63db\u662f\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u5e38\u898b\u7684\u9700\u6c42\uff0cMS SQL Server \u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u4f86\u652f\u6301\u6578\u64da\u985e\u578b\u4e4b\u9593\u7684\u8f49\u63db\u3002<\/p>\n
1. CAST \u548c CONVERT \u51fd\u6578<\/h3>\n
\u9019\u5169\u500b\u51fd\u6578\u53ef\u4ee5\u5c07\u4e00\u7a2e\u6578\u64da\u985e\u578b\u8f49\u63db\u70ba\u53e6\u4e00\u7a2e\u6578\u64da\u985e\u578b\u3002CAST()<\/code> \u662f ANSI SQL \u6a19\u6e96\u51fd\u6578\uff0c\u800c CONVERT()<\/code> \u5247\u662f MS SQL Server \u7279\u6709\u7684\u51fd\u6578\uff0c\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u683c\u5f0f\u9078\u9805\u3002<\/p>\n
SELECT \n    CAST(OrderDate AS DATE) AS OrderDateOnly, \n    CONVERT(VARCHAR(10), OrderDate, 101) AS FormattedOrderDate \nFROM \n    Orders;<\/code><\/pre>\n
\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 CAST()<\/code> \u5c07\u8a02\u55ae\u65e5\u671f\u8f49\u63db\u70ba\u65e5\u671f\u985e\u578b\uff0c\u4e26\u4f7f\u7528 CONVERT()<\/code> \u5c07\u5176\u683c\u5f0f\u5316\u70ba\u7279\u5b9a\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u3002\u9019\u5728\u751f\u6210\u5831\u544a\u6216\u986f\u793a\u6578\u64da\u6642\u975e\u5e38\u6709\u7528\u3002<\/p>\n
2. STRING_AGG \u51fd\u6578<\/h3>\n
\u5728\u8655\u7406\u5b57\u7b26\u4e32\u6578\u64da\u6642\uff0cSTRING_AGG()<\/code> \u51fd\u6578\u53ef\u4ee5\u5c07\u591a\u884c\u5b57\u7b26\u4e32\u5408\u4f75\u70ba\u4e00\u884c\uff0c\u4e26\u4f7f\u7528\u6307\u5b9a\u7684\u5206\u9694\u7b26\u3002\u9019\u5728\u751f\u6210\u5831\u544a\u6216\u532f\u7e3d\u6578\u64da\u6642\u7279\u5225\u6709\u7528\u3002<\/p>\n
SELECT \n    Department, \n    STRING_AGG(EmployeeName, ', ') AS EmployeeNames \nFROM \n    Employees \nGROUP BY \n    Department;<\/code><\/pre>\n
\u9019\u500b\u67e5\u8a62\u5c07\u6bcf\u500b\u90e8\u9580\u7684\u54e1\u5de5\u59d3\u540d\u5408\u4f75\u70ba\u4e00\u500b\u5b57\u7b26\u4e32\uff0c\u4e26\u7528\u9017\u865f\u5206\u9694\uff0c\u65b9\u4fbf\u67e5\u770b\u548c\u5206\u6790\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
MS SQL Server \u7684\u51fd\u6578\u5728\u6578\u64da\u8a08\u7b97\u548c\u6578\u64da\u8f49\u63db\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u89d2\u8272\u3002\u901a\u904e\u4f7f\u7528\u805a\u5408\u51fd\u6578\u548c\u6578\u5b78\u51fd\u6578\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u9032\u884c\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u751f\u6210\u3002\u800c\u4f7f\u7528 CAST<\/code>\u3001CONVERT<\/code> \u548c STRING_AGG<\/code> \u51fd\u6578\uff0c\u5247\u80fd\u5920\u6709\u6548\u5730\u8655\u7406\u548c\u683c\u5f0f\u5316\u6578\u64da\u3002\u9019\u4e9b\u529f\u80fd\u4f7f\u5f97 MS SQL Server \u6210\u70ba\u4e00\u500b\u5f37\u5927\u7684\u6578\u64da\u5eab\u7ba1\u7406\u5de5\u5177\uff0c\u9069\u5408\u5404\u7a2e\u696d\u52d9\u9700\u6c42\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 \u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5206\u6790 MS SQL Server \u51fd\u6578\u7684\u5169\u7a2e\u5be6\u969b\u7528\u6cd5\uff0c\u63a2\u8a0e\u5176\u5728\u6578\u64da\u8655\u7406\u548c\u6027\u80fd\u512a\u5316\u4e2d\u7684\u61c9\u7528\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-154517","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/154517","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=154517"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/154517\/revisions"}],"predecessor-version":[{"id":154518,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/154517\/revisions\/154518"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=154517"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=154517"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=154517"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}