From: Tom Lane <tgl@sss.pgh.pa.us>
To: Chester Kustarz <chester@arbor.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: move forward 0 from foo;
Date: Tue, 23 Mar 2004 17:37:10 -0500
Message-ID: <7253.1080081430@sss.pgh.pa.us> (raw)
In-Reply-To: <Pine.BSO.4.44.0403231601530.18218-100000@detroit.arbor.net>
References: <Pine.BSO.4.44.0403231601530.18218-100000@detroit.arbor.net>
Chester Kustarz <chester@arbor.net> writes:
> I expected "MOVE FORWARD 0 FROM foo;" to always return
> 0, but I have found this not to be the case.
You are misinterpreting the output. The result is the number of rows
that would have been returned by a FETCH with the same parameters.
FETCH 0 means "re-fetch current row" (don't blame us, this is per SQL
spec), and so it will return 1 row unless you are currently positioned
off the end of the result. Hence, MOVE 0 returns either 0 or 1
depending on whether you are currently on a row.
It looks like the MOVE documentation is a bit poorly worded; I'll do
something about that.
regards, tom lane
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Cc: tgl@sss.pgh.pa.us, chester@arbor.net
Subject: Re: move forward 0 from foo;
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