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SqlServer2012中First_Value函数简单分析_MsSql_

2023-05-26 534人已围观

简介 SqlServer2012中First_Value函数简单分析_MsSql_

First_Value返回结果集中某列第一条数据的值，跟TOP 1效果一样，比较简单的一个函数

先贴测试用代码

 DECLARE @TestData TABLE( ID INT IDENTITY(1,1), Department VARCHAR(20), LastName VARCHAR(20), Rate FLOAT ) INSERT INTO @TestData(Department,LastName,Rate) SELECT 'Document Control','Arifin',17.7885 UNION ALL SELECT 'Document Control','Norred',16.8269 UNION ALL SELECT 'Document Control','Kharatishvili',16.8269 UNION ALL SELECT 'Information Services','Chai',10.25 UNION ALL SELECT 'Information Services','Berge',10.25 UNION ALL SELECT 'Information Services','Trenary',50.4808 UNION ALL SELECT 'Information Services','Conroy',39.6635 UNION ALL SELECT 'Information Services','Ajenstat',38.4615 UNION ALL SELECT 'Information Services','Wilson',38.4615 UNION ALL SELECT 'Information Services','Connelly',32.4519 UNION ALL SELECT 'Information Services','Meyyappan',32.4519 SELECT * FROM @TestData