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

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• Re: Strange query plan at 2001-06-05 14:21:12 from Tom Lane

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• Re: Strange query plan at 2001-06-05 14:42:34 from Tom Lane

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