Re: How to safely compare transaction id?

From: "Trevor Talbot" <quension(at)gmail(dot)com>
To: alphax <alphax(at)vip(dot)163(dot)com>
Cc: pg-general <pgsql-general(at)postgresql(dot)org>
Subject: Re: How to safely compare transaction id?
Date: 2008-01-14 00:32:59
Message-ID: 90bce5730801131632p5ff77c9r4a3fa09cc0e39033@mail.gmail.com
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On 1/11/08, alphax <alphax(at)vip(dot)163(dot)com> wrote:

> I want to determines a given record which visible to current transaction
> whether or not be updated after some time point, that time point is
> indicated by aother transaction id started and committed in past time.

I'm not sure I understand, but maybe this thread will help?
http://archives.postgresql.org/pgsql-general/2007-10/msg00503.php

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