Re: unique constraint violation on multiple-rows update

From: Karsten Hilbert <Karsten(dot)Hilbert(at)gmx(dot)net>
To: pgsql-general <pgsql-general(at)postgresql(dot)org>
Subject: Re: unique constraint violation on multiple-rows update
Date: 2026-04-19 21:03:27
Message-ID: aeVDH-PnW6_6VDV_@hermes.hilbert.loc
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Am Sun, Apr 19, 2026 at 11:17:47AM -0400 schrieb Tom Lane:

> > Am Sun, Apr 19, 2026 at 06:54:02AM -0700 schrieb David G. Johnston:
> >> You know about deferred constraints, you should use them here. This is one
> >> of the key use cases motivating their existence.
>
> > Indeed. I was of the mistaken impression that UNIQUE
> > constraints were not deferrable ...
>
> Once upon a time they were not, but we fixed that years ago.

A late thanks, it came in handy today :-)

Karsten
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