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• 前端之家
• MsSQL
• sqlserver中重复数据值只取一条的sql语句

<div class="codebody" id="code32970">
--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
declare @i int
set @counts = 10000
set @i = 1 while @i<=@counts
begin
insert TestData (Data,ColA,ColB) values(cast(rand()10000 as int),cast(rand() as varchar(20)),cast(rand() as varchar(20)))
set @i=@i+1
end --获取数据(重复数据只取一条)
select from TestData
where
id in
(
--根据Data分类获取数据最小ID列表
select min(id) from TestData
group by Data
)