你能帮忙解决这个问题吗?
表结构如下:
现在,如果我有一个LoanId,我怎样才能找到已经获得给定LoanId的属性ownerId的所有属性?
我现在有以下但它看起来很尴尬:
Select po.OwnerId, po.PropertyId
from Property
join PropertyOwner po on po.PropertyId= Property.PropertyId
join PropertyOwner po2 on po2.OwnerId = po.OwnerId
join Property pp on po2.PropertyId= pp.PropertyId and pp.LoanId = @_givenLoanId
有没有更好的办法?
存在的想法是对你正在做的事情的更直接的解释:
Select po.OwnerId, po.PropertyId
from PropertyOwner po
where exists (select 1
from Property p2 join
PropertyOwner po2
on p2.PropertyId = po2.PropertyId
where po2.OwnerId = po.OwnerId and
p2.LoanId = @_givenLoanId
);
这就是你要找的东西:
SELECT OwnerId, PropertyId
FROM PropertyOwner
WHERE OwnerId IN
(
SELECT DISTINCT o.OwnerId
FROM Property p
JOIN PropertyOwner o
ON o.PropertyId = p.PropertyId
WHERE LoanId = @_givenLoanId
);