sqlserver2005有关键字ntile(x)和over(partition by.. order by..)子句配合.
比如获取每个表的前10%个字段。
select
id
,
name
,
colid
,
rn
from(
select * , rn = ntile( 10)
over( partition by id order by colorder)
from syscolumns ) t where rn = 1
select * , rn = ntile( 10)
over( partition by id order by colorder)
from syscolumns ) t where rn = 1
