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

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

 

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]