请教高手

[zlLinkinPark]

三张表连接，表1内容为
id count
A 90
B 100
C 80
D 80
E 78
表2内容为
id count1
A 40
B 100
表3内容为
id count2
A 50
C 80
D 80
E 78
其中表1表示5种物品的总销售量,表2和表3表示两名销售人员的销售情况。
要求三表连接后形成
id count1 count2
A 40 50
B 100 0
C 0 80
D 0 80
E 0 78

[chinaandys]

select a.id,count1=isnull(b.count1,0),count2=isnull(c.count2,0) from tb1 a left join tb2 b
on a.id=b.id
left join tb3 c
on a.id=c.id

[Andy__Huang]

select a.id,count1=isnull(b.count1,0),count2=isnull(c.count2,0)
from ta a
left join tb b on a.id=b.id
left join tc c on a.id=c.id

[xluzhong]

select
a.id,
count1=isnull(b.count1,0),
count2=isnull(c.count2,0)
from ta a
left join tb b
on a.id=b.id
left join tc c
on a.id=c.id

[xluzhong]

select
a.id,
count1=isnull(b.count1,0),
count2=isnull(c.count2,0)
from ta a
left join tb b
on a.id=b.id
left join tc c
on a.id=c.id

[jiang130]

select a.id,count1=isnull(b.count1,0),count2=isnull(c.count2,0) from 表1 a
left join 表2 b on a.id=b.id
left join 表3 c on a.id=c.id

[lishengyu]

select a.id,count1=isnull(b.count1,0),count2=isnull(c.count2,0) from 表1 a
left join 表2 b on a.id=b.id
left join 表3 c on a.id=c.id

[zlLinkinPark]

好象left join 只能用于两张表啊？