sql語句:取按a列分組後,b列最大,的所有列的記錄
阿新 • • 發佈：2019-02-13
例如:
| a | b | c |
| 1 | 5 | abc |
| 2 | 6 | bcd |
| 1 | 7 | ade |
| 2 | 8 | adc |
若取按a列分組後,b列最大,的所有列的記錄,
| a | b | c |
| 1 | 6 | bcd |
| 2 | 8 | adc |
可以使用如下語句
select
*
from
test
where
b
in
(
select
max
(id)
from
test
group
by
a)
適用於所有資料庫
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
適用於所有資料庫
select
a,b,c
from
(
select
a,b,c
,row_number()
over
(partition
by
a
order
by
b
desc
) rn
)
where
rn
=
1
適用於oracle