sqlserver中重复数据值只取一条的sql语句

复制代码 代码如下:

--建立数据表createtable TestData
(
ID int identity(1,1) primary key,
Data int,
ColA varchar(20),
ColB varchar(20)
)
go

--插入测试数据
declare @counts int
decla 编程客栈 re @i int
set @counts = 10000
set @i = 1

while @i<=@counts
begin
insert TestDat http://www.cppcns.com a (Data,ColA,ColB) values(cast(rand()*10000 as int),cast(rand() as varchar(20)),cast(rand() as varchar(20)))
set @i=@i+1 js
end

--获取数据(重复数据只取一条)
select * from TestData
where
id in
(
--根据Data分类获取 javascript 数据最小ID列表 编程
select min(id) from TestData
group by Data
)

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