在Oracle中加入两个表

Question

我需要类似的东西：

select * 
from table1 
where {if PKID = MasterPKID - (that PKID should not be present as refNo in table2)}.

ie-652不应出现在表2中

我完全无能为力。

我们可以在一个查询中实现吗？

Answer 1

使用Not exists

select * 
from table1 a
where PKID = MasterPKID
and not exists (select 1 from table2 b where a.PKID = b.refno)