Re: create if not exists (CINE)

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Andrew Dunstan <andrew(at)dunslane(dot)net>, Chris Browne <cbbrowne(at)acm(dot)org>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: create if not exists (CINE)
Date: 2009-05-06 01:45:15
Message-ID: 16905.1241574315@sss.pgh.pa.us
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Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> 1. Why should it do nothing if the object already exists (as opposed
> to any other alternative)?

> Answer: Because that's what "CREATE IF NOT EXISTS" means when
> interpreted as English.

The argument was not about whether that is the "plain meaning" of the
phrase; it was about whether that is a safe and useful behavior for a
command to have. There is a pretty substantial group of people who
think that it would be quite unsafe, which is why we failed to arrive
at a consensus that this is a good thing to implement.

regards, tom lane

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