sql语句:取按a列分组后,b列最大,的所有列的记录

例如:

test 表

a	b	c
1	5	abc
2	6	bcd
1	7	ade
2	8	adc

若取按a列分组后,b列最大,的所有列的记录,

result

a	b	c
1	6	bcd
2	8	adc

可以使用如下语句



select

*

from
test
where
b
in
(
select

max
(id)
from
test
group

by
a)



适用于所有数据库



select
t1.a,t1.b,t1.c



from
test t1



inner

join



(seelct a,
max
(b)
as
b
from
test
group

by
a) t2



on
t1.a
=
t2.a
and
t1.b
=
t2.b



适用于所有数据库



select
a,b,c



from
(



select
a,b,c



,row_number()
over
(partition
by
a
order

by
b
desc
) rn



from
test



)



where
rn
=
1

适用于oracle