From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
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
In-reply-to: <20150520171116.GE27868@alap3.anarazel.de>
References: 
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 <20150508150340.GJ12950@alap3.anarazel.de>
 <CAA-aLv6gJ0Ur4rsrv4gfban9w6B16FN5K6tozxUgcNMCBdV00g@mail.gmail.com>
 <20150520165406.GD27868@alap3.anarazel.de>
 <CAA-aLv7PwX24Ex2EWceOUtg0oEjdTbYiQ670j4dWf2nR369oUA@mail.gmail.com>
 <20150520171116.GE27868@alap3.anarazel.de>
Comments: In-reply-to Andres Freund <andres@anarazel.de>
 message dated "Wed, 20 May 2015 19:11:16 +0200"
Date: Wed, 20 May 2015 13:31:57 -0400
Message-ID: <4215.1432143117@sss.pgh.pa.us>
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Sender: pgsql-hackers-owner@postgresql.org

Andres Freund <andres@anarazel.de> writes:
> On 2015-05-20 18:09:05 +0100, Thom Brown wrote:
>>>> This implies that an exclusion constraint is valid in the statement,
>>>> which contradicts the docs.  Which one is correct?

>>> ON CONFLICT can be used for ... DO NOTHING as well.

>> Yes, but still confusing when not using DO NOTHING.

> I'm not sure I can follow. INSERT INTO account VALUES(...) ON CONFLICT
> (email) DO NOTHING; seems to make sense to me?

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.

			regards, tom lane


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