一条语句实现查询各类别前10条记录

2010-04-21 21:08

表：
id   name type

1     a      t1 
2     b      t2
3     c      t3

我想查 各类别的前10条记录 SQL怎么写

测试如下：

create table Product
(
Id int identity primary key,
[Name] varchar(20),
[Type] int not null
)

insert into Product values('a',1)
insert into Product values('b',1)
insert into Product values('c',1)
insert into Product values('d',2)
insert into Product values('e',2)
insert into Product values('f',2)
insert into Product values('g',3)
insert into Product values('h',3)
insert into Product values('i',3)
insert into Product values('j',3)

--//方法1
select * from (
select row_number() over(partition by [Type] order by Id) as RowID,
    [Name],Id,[Type]
     from Product
) t
where t.rowid < 3

--//方法2
select * from Product as t where 
id in (select top 2 id from Product where [type]=t.[Type] order by id)