Re: Trigger: Column Update

From: Guillaume Lelarge <guillaume(at)lelarge(dot)info>
To: Ricardo Bayley <ricardo(dot)bayley(at)gmail(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: Trigger: Column Update
Date: 2010-11-12 17:49:52
Message-ID: 4CDD7E40.2020401@lelarge.info
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Le 12/11/2010 18:37, Ricardo Bayley a écrit :
> Hi,
>
> I am wondering if there is a way to identify which columns have been
> modified. Is there some sort of TG_TABLE_NAME, which states the
> modified columns ?

Nope. You should check yourself.

> Or should we check this ourselves doing something like OLD.columnA !=
> NEW.columnA ?

Use IS DISTINCT OF instead of = to deal with NULL values.

--
Guillaume
http://www.postgresql.fr
http://dalibo.com

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