Re: How to safely compare transaction id?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: alphax <alphax(at)vip(dot)163(dot)com>
Cc: Marko Kreen <markokr(at)gmail(dot)com>, pg-general <pgsql-general(at)postgresql(dot)org>
Subject: Re: How to safely compare transaction id?
Date: 2008-01-13 17:33:28
Message-ID: 6244.1200245608@sss.pgh.pa.us
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alphax <alphax(at)vip(dot)163(dot)com> writes:
> So, it seems the system column "cmin" is the logical "current version"
> of that record, isn't it?

No. Have you read
http://www.postgresql.org/docs/8.2/static/ddl-system-columns.html

regards, tom lane

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