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Re: Check constraints on non-immutable keys

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Peter Eisentraut <peter_e(at)gmx(dot)net>, Magnus Hagander <magnus(at)hagander(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Check constraints on non-immutable keys
Date: 2010-06-30 23:41:56
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Wed, Jun 30, 2010 at 6:57 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> The detailed definition is amazingly laborious and yet limited, though,
>> as it basically doesn't address the problem except for that specific
>> case and close relatives.

> Well, solving the problem in general is equivalent to the halting problem, so...

So is proving determinism.  They had the sense to *not* try to define
what that means.

			regards, tom lane

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