From: | Richard Broersma Jr <rabroersma(at)yahoo(dot)com> |
---|---|
To: | Richard Broersma Jr <rabroersma(at)yahoo(dot)com>, "John D(dot) Burger" <john(at)mitre(dot)org>, PostgreSQL General <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Lifting WHERE conditions out of inner select |
Date: | 2007-10-08 20:16:31 |
Message-ID: | 519702.62747.qm@web31805.mail.mud.yahoo.com |
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Lists: | pgsql-general |
OOPs!
--- Richard Broersma Jr <rabroersma(at)yahoo(dot)com> wrote:
> --- "John D. Burger" <john(at)mitre(dot)org> wrote:
> > My question is, should the planner have figured this out, and we're
> > just losing out because we're stuck in 7.4? Or is there some subtle
> > difference in semantics I'm missing? The select results were the
> > same in both cases, but I'm willing to believe that's an accident of
> > our data.
>
> I don't know if this helps.
>
> SELECT lemma
> FROM word AS W
> INNER JOIN sense AS S
> ON W.wordid = S.wordid
> INNER JOIN semlinkref AS R
> ON R.synset1id = S.synsetid
> AND R.synset2id = S.synsetid
> INNER JOIN synset AS T
> ON S.synsetid = T.synsetid
> WHERE W.lemma = 'scramble'
> AND R.linked = 1
> AND T.pos='v'
> ORDER BY lemma;
>
> Regards,
> Richard Broersma Jr.
>
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