selection of a single record using the UNION
Hello. I have two tables different 'address' (home and work). In some cases, a person will have a record in the two arrays 'address', while some people will have only a record in one or the other. I want to return a single record set by b.SID. So if a person has a criminal record in the two tables then I'm just grabbing a name and an address. How can I do this?Select b.SID, b.address
people a, b House
where b.name = b.SID
UNION
Select b.SID, b.address
people, work b
where b.SID = b.name;
something like
select a.name, NVL(b.address, c.address) address
from people a, home b, work c
where a.name = b.name(+)
and a.name= c.name(+)
Tags: Database
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