Urgently ask for a SQL sentence!

hzicbc

For example table aa:
aa bb cc
1 255 20161212
1 15 20161210
2 33 20160612
2 11 20160101
Sorted by DESC by cc,
For example, I want to delete the latest time data in where aa='2'or other places.
Result table aa:
aa bb cc
1 255 20161212
2 33 20160612

Thank you!

mikeyehong

delect from aa where aa='2'

terran1208

create table tt
(
  aa int,
  bb int,
  cc varchar(08)
)
insert into tt
select 1, 255, '20161212' union
select 1, 15, '20161210' union
select 2, 33, '20160612' union
select 2, 11, '20160101'

select a.*
from tt a
where not exists
(select 1 from tt where aa = a.aa and cc> a.cc)

罗莉塔

delete from t where aa=2 and cc in (select max (cc) from t where aa =2)
select * from t