Question

I’m having trouble getting a viable query where I can have multiple required records and a single “one of two” exists.

I’m using Hibernate, hql, the sql obviously wouldn’t be radically different, but it means that I can’t use a full join (and therefore awkward).

What I basically want, but can’t because I don’t know how to mix inner and out exist calls :

select 1
from  application
where
application = ? and
exists (select 1 from x where ...) and
exists (select 1 from y where ...) and
exists ((exists (select 1 from Document where ...))
or 
(exists (select 1 from QA answer where ...)))

So I need x & y, but either Document or QA can be acceptable, as long as 1 exists.

Answer 1

Something like this?

select 1
from  application
where
application = ? and
exists (select 1 from x where ...) and
exists (select 1 from y where ...) and
(
    exists (select 1 from Document where ...)
    or 
    exists (select 1 from QA answer where ...)
);