| From: | Michael Meskes <meskes(at)topsystem(dot)de> |
|---|---|
| To: | vadim(at)sable(dot)krasnoyarsk(dot)su (Vadim B(dot) Mikheev) |
| Cc: | pgsql-hackers(at)postgresql(dot)org (PostgreSQL Hacker) |
| Subject: | Re: [HACKERS] Subselects are in CVS... |
| Date: | 1998-02-13 13:53:29 |
| Message-ID: | 199802131353.OAA21354@gauss.topsystem.de |
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| Lists: | pgsql-hackers |
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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