Unique transaction ID

From: Robert Osowiecki <robson(at)cavern(dot)pl>
To: pgsql-general(at)postgresql(dot)org
Subject: Unique transaction ID
Date: 2006-01-04 10:18:03
Message-ID: 43BBA0DB.3010904@cavern.pl
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Apart from now() function, is there some kind of sequence that advances
with each transaction started? If not: is it possible to implement that
using sequences?

Robson.

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