Re: Receiving many more rows than expected

From: David G Johnston <david(dot)g(dot)johnston(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Re: Receiving many more rows than expected
Date: 2014-05-12 17:10:36
Message-ID: 1399914636896-5803687.post@n5.nabble.com
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Did you try rewriting the query to avoid using an IN expression?

UPDATE foo SET processing = 't'
FROM (
SELECT id FROM foo WHERE processing = 'f' ORDER BY id ASC LIMIT 5000 FOR
UPDATE
) src
WHERE foo.id = src.id;

The workaround I mentioned above said that a CTE was needed but I'm thinking
that a simply FROM would be just as effective. Otherwise:

UPDATE foo SET processing = 't'
FROM (
WITH ids_to_update AS (
SELECT id FROM foo WHERE processing = 'f' ORDER BY id ASC LIMIT 5000 FOR
UPDATE
)
SELECT id FROM ids_to_update
) src
WHERE foo.id = src.id;

David J.

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