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To: pgsql-docs@lists.postgresql.org
Cc: robin@jonssonhector.com
Subject: Data visibility for returning statement
Date: Fri, 25 Apr 2025 07:21:22 +0000
Message-ID: <174556568268.3018509.17516011309250353751@wrigleys.postgresql.org> (raw)
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/17/dml-returning.html
Description:
Today I found a pretty special use-case for the "RETURNING" functionality,
which I cannot find documentation for?
If you have a statement as follows:
UPDATE persons SET name = 'Bob' WHERE id = 4
RETURNING (SELECT name FROM persons WHERE id = 4)
The returning data will be whatever the value was before the row was
modified. This differs from if I were to "RETURNING name". I found this to
be interesting and could possibly warrant some kind of explanation in the
documentation?
Best regards
Robin
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To: pgsql-docs@postgresql.org
Cc: noreply@postgresql.org, pgsql-docs@lists.postgresql.org, robin@jonssonhector.com
Subject: Re: Data visibility for returning statement
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