计算获取最小值和最大值

比如，在下面的销售业绩中，统计业务员的销售业绩中最大值和最小值。

下面是业务数据：

 

CREATE TABLE [dbo].[SalesPerformance](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Salesman] NVARCHAR(30) NOT NULL,
    [OrderDate] [DATE] NULL,
    [Sell]    DECIMAL(18,2) NULL
 )
GO

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填充数据：

INSERT INTO [dbo].[SalesPerformance] ([Salesman],[OrderDate],[Sell])
VALUES (\'S0003\',\'2019-05-12\',23800.00),
(\'S0008\',\'2019-05-19\',66528.00),
(\'S0001\',\'2019-05-05\',35455.00),
(\'S0001\',\'2019-05-18\',75220.00),
(\'S0003\',\'2019-05-17\',33658.00),
(\'S0041\',\'2019-05-10\',56300.00),
(\'S0041\',\'2019-05-11\',41811.00),
(\'S0003\',\'2019-05-20\',26309.00)
GO

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使用FIRST_VALUE和LAST_VALUE函数进行分组查询：

 

SELECT [ID],[Salesman],[OrderDate],[Sell],
    FIRST_VALUE([Sell])  OVER (PARTITION BY [Salesman] ORDER BY [Sell]) [最低销售额],
    LAST_VALUE([Sell]) OVER (PARTITION BY [Salesman] ORDER BY [Sell]) [最高销售额]
FROM [dbo].[SalesPerformance]

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