How do you detect row version changes in PostgreSQL?

From: "Craig Manley" <bitneuker666(at)hotmail(dot)com>
To: <pgsql-sql(at)hub(dot)org>
Subject: How do you detect row version changes in PostgreSQL?
Date: 2000-08-29 10:46:40
Message-ID: OE7Fsxf4yp8ARf3sllN00000660@hotmail.com
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Hi all,
Some databases have a hidden field that contains a row version key.
Everytime an update is performed on a row the value of the version field
changes. Does PostgreSQL have a similar hidden field? If not then I guess
using a before update trigger that modifies a user defined field will
provide an alternative solution.
Greetings,
Craig Manley.

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