Re: Strange query plan

On Tue, 5 Jun 2001, Tom Lane wrote:

> Oleg Bartunov <oleg(at)sai(dot)msu(dot)su> writes:
> > The best plan I've got eliminating IN predicate:
> > select msg_prt.tid as mid from msg_prt
> > where exists (select idx.tid from idx where msg_prt.tid=idx.tid
> > and idx.did=1 and idx.lid = 1207 and idx.lid=59587 )
>
> Surely that returns zero rows?
>

Oops, sorry :-)
should be
select msg_prt.tid as mid from msg_prt
where exists (select idx.tid from idx where msg_prt.tid=idx.tid
and idx.did=1 and ( idx.lid = 1207 or idx.lid=59587 ));

but this is not a big win.

Anyway, what's about original query ?

> regards, tom lane
>

Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83