From: Sidar López Cruz <sidarlopez@hotmail.com>
To: pgsql-performance@postgresql.org
Subject: performance on query
Date: Wed, 26 Oct 2005 17:47:31 -0600
Message-ID: <BAY23-F36614886359D96AC48B8BCE690@phx.gbl> (raw)
I DON'T KNOW WHAT TO DO WITH THIS QUERYS...
Comparation with sql server, sql server wins !!!
Table sizes:
archivos: 40MB
fotos: 55MB
select count(1) from fotos f where not exists (select a.archivo from
archivos a where a.archivo=f.archivo)
173713 ms.
110217 ms.
83122 ms.
select count(*) from
(
select archivo from fotos
except
select archivo from archivos
) x;
201479 ms.
SELECT count(*)
FROM fotos f
LEFT JOIN archivos a USING(archivo)
WHERE a.archivo IS NULL
199523 ms.
_________________________________________________________________
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To: pgsql-performance@postgresql.org
Cc: sidarlopez@hotmail.com
Subject: Re: performance on query
In-Reply-To: <BAY23-F36614886359D96AC48B8BCE690@phx.gbl>
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