how to tell if column set on update

From: chester c young <chestercyoung(at)yahoo(dot)com>
To: sql pgsql <pgsql-sql(at)postgresql(dot)org>
Subject: how to tell if column set on update
Date: 2009-07-20 13:19:39
Message-ID: 74512.7116.qm@web54304.mail.re2.yahoo.com
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within a trigger need to know if the UPDATE statement set a column. the column might be set to the old value or a different value.

(want to make sure the app is sending all necessary values)

thanks

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