数据如下,表名 AAA
|
classid
|
order
|
name
|
|
1
|
1
|
a
|
|
1
|
2
|
b
|
|
1
|
3
|
c
|
|
2
|
1
|
d
|
|
2
|
2
|
e
|
|
2
|
3
|
f
|
|
3
|
1
|
g
|
|
3
|
2
|
h
|
|
3
|
3
|
i
|
期望结果如下
|
classid
|
name1
|
name2
|
name3
|
|
1
|
a
|
b
|
c
|
|
2
|
d
|
e
|
f
|
|
3
|
g
|
h
|
i
|
sql如下:
select
classid,
max(case when orderid =1 then name else '' end ) as
name 1 ,
max(case when orderid =2 then name else '' end ) as
name 2,
max(case when orderid =3 then name else '' end ) as
name 3
from AAA group by
classid
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