Oracle表另命名的问题

Question

select count(*) as num from IS_ContractHis a,(select b.IID,a.SModel,sum(a.ISetts) as tsetts,sum(b.FTOTALAMOUNT) as NFTOTALAMOUNT from IS_ContractOrder a ,IS_Contract b where a.IID=b.IID group by b.IID,a.SModel) b where a.IID=b.IID and b.？ like '%ll%'
我想知道我标致了？的那个b表所代表的是语句中那个表？
多谢！！

Answer 1

是这个子查询的结果集：
code="sql" as tsetts,
sum(b.FTOTALAMOUNT) as NFTOTALAMOUNT
from IS_ContractOrder a, IS_Contract b
where a.IID = b.IID
group by b.IID, a.SModel)
[/code]

其实你把语句在PL/SQL中Beautifier一下就很容易看出来啦：
[code="sql"]
select count(*) as num
from IS_ContractHis a,
(select b.IID,
a.SModel,
sum(a.ISetts) as tsetts,
sum(b.FTOTALAMOUNT) as NFTOTALAMOUNT
from IS_ContractOrder a, IS_Contract b
where a.IID = b.IID
group by b.IID, a.SModel) b
where a.IID = b.IID
and b.？ like '%ll%'
[/code]