三个表:
A (id,字段1,字段2,字段3)
B (id,字段5,字段6,字段7)
C (id,字段8,字段9,字段10)
已知:
A表 id不重复,主键
B表
sum(字段5) as zje1 group by B.id
C表
sum(字段8) as zje2 group by C.id
请问如何显示出
(A (id,字段1,字段2,字段3,zje1, zje2))
------解决方案--------------------
select a.*,b.zje1,c.zje2
from tableA as a
left join
(select id,sum(字段5) as zje1 from tableB group by id) as b on a.id = b.id
left join
(select id,sum(字段8) as zje2 from tableC group by id) as c on a.id = c.id