From: Tom Lane <tgl@sss.pgh.pa.us>
To: Joe Conway <mail@joeconway.com>
Cc: Richard Jones <rich@annexia.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: Very large IN-clause is slow, but how to rewrite it?
Date: Sun, 25 Feb 2007 13:34:44 -0500
Message-ID: <9473.1172428484@sss.pgh.pa.us> (raw)
In-Reply-To: <45E1D4FC.4050901@joeconway.com>
References: <20070225123913.GA17124@furbychan.cocan.org>
<7794.1172422591@sss.pgh.pa.us>
<45E1D4FC.4050901@joeconway.com>
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),...)
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, mail@joeconway.com, rich@annexia.org
Subject: Re: Very large IN-clause is slow, but how to rewrite it?
In-Reply-To: <9473.1172428484@sss.pgh.pa.us>
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