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how to tell if column set on update - Mailing list pgsql-sql

From chester c young
Subject how to tell if column set on update
Date
Msg-id 74512.7116.qm@web54304.mail.re2.yahoo.com
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Responses Re: how to tell if column set on update
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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
differentvalue.
 

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

thanks

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