--建立數(shù)據(jù)表createtable TestData
(
ID int identity(1,1) primary key,
Data int,
ColA varchar(20),
ColB varchar(20)
)
go --插入測(cè)試數(shù)據(jù)
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 --獲取數(shù)據(jù)(重復(fù)數(shù)據(jù)只取一條)
select * from TestData
where
id in
(
--根據(jù)Data分類獲取數(shù)據(jù)最小ID列表
select min(id) from TestData
group by Data
)