1樓:
select t1.*,isnull(t2.b2,0) from 表a t1 left join 表b t2 on t1.t=t2.t
union all
select t2.t,isnull(t1.a1,0),t2.
b2 from 表a t1 right join 表b t2 on t1.t=t2.t where t1.
t is null
2樓:
select t,sum(a1) a1, sum(b2) b2from(
select t,a1,0 as b2
from 表a
union
select t,0 as a1,b2
from 表b
) cgroup by t
3樓:匿名使用者
select t=isnull(a.t,b.t),a1=isnull(a1,0),b1=isnull(b1,0)
from a full join b on a.t=b.t
4樓:
select isnull(a.t,b.t) as t,isnull(a.
a1,0) as a1,isnull(b.b2,0) as b2 from a full outer join b on a.t=b.t
請教SQL語句,請教一個SQL語句
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