From: Richard Jones <rich@annexia.org>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Joe Conway <mail@joeconway.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Very large IN-clause is slow, but how to rewrite it?
Date: Sun, 25 Feb 2007 19:39:05 +0000
Message-ID: <20070225193905.GD16669@furbychan.cocan.org> (raw)
In-Reply-To: <9473.1172428484@sss.pgh.pa.us>
References: <20070225123913.GA17124@furbychan.cocan.org>
<7794.1172422591@sss.pgh.pa.us>
<45E1D4FC.4050901@joeconway.com>
<9473.1172428484@sss.pgh.pa.us>
On Sun, Feb 25, 2007 at 01:34:44PM -0500, Tom Lane wrote:
> Joe Conway <mail@joeconway.com> writes:
> > If 8.2, what about
> > ... WHERE foo IN (select x from (values (1$),(2$),...,(N$)) as t(x))
> > ?
>
> Well, the OP wasn't using 8.2 --- judging from the selected plan, it had
> to be 8.0 or older. But yeah, a values-list is an interesting
> alternative on 8.2. I think actually you don't need all that much extra
> notation; this seems to work:
>
> WHERE foo IN (VALUES ($1),($2),($3),...)
That's right, it is in fact PG 7.4.
I will try the values suggestion to see if that makes a difference.
Rich.
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To: pgsql-sql@postgresql.org
Cc: rich@annexia.org, tgl@sss.pgh.pa.us, mail@joeconway.com
Subject: Re: Very large IN-clause is slow, but how to rewrite it?
In-Reply-To: <20070225193905.GD16669@furbychan.cocan.org>
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