MSsql下如何帅选资料？请问如何筛选出每个LOTID下CleanTime的一笔资料？谢谢[解决办法]select * from(select
MSsql下如何帅选资料？
请问如何筛选出每个LOTID下CleanTime的一笔资料？
谢谢
[解决办法]
select * from
(select *,row_number() over(partition by LOTID order by CleanTime) 'rn'
from [表名]
) t where rn=1
[解决办法]
用row_number函数就可以了哈，非常简洁：
select *
from
(
select *,
row_number() over(partition by LOTID order by CleanTime desc) as rownum
from tb
) t
where rownum=1