Date: Wed, 20 May 2015 19:37:06 +0200
From: Andres Freund <andres@anarazel.de>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Thom Brown <thom@linux.com>, Peter Geoghegan <pg@heroku.com>,
 hlinnaka <hlinnaka@iki.fi>, Jeff Janes <jeff.janes@gmail.com>,
 Stephen Frost <sfrost@snowman.net>,
 Dean Rasheed <dean.a.rasheed@gmail.com>, Bruce Momjian <bruce@momjian.us>,
 Pg Hackers <pgsql-hackers@postgresql.org>
Subject: Re: INSERT ... ON CONFLICT UPDATE/IGNORE 4.0
Message-ID: <20150520173706.GF27868@alap3.anarazel.de>
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On 2015-05-20 13:31:57 -0400, Tom Lane wrote:
> Sure, but on what basis does it decide that there's a conflict?
> 
> If you can't use an exclusion constraint to support the command,
> then the error message shouldn't be worded like that.

But you *can* use a exclusion constraint for DO NOTHING. Just not (yet)
for DO UPDATE.


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