Vadim B. Mikheev writes:
> 5. I need in advice: if subquery introduced with NOT IN doesn't return
> any tuples then qualification is failed, yes ?
Do you mean something like this:
select * from table1 where x not in (select x from table2)
table1.x: a,b
table2.x is empty
The correct answer IMO is 'a,b' in this case.
Michael
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