absolute or relative updates

"pgsql-general@xxxxxxxxxxxxxxxx" <pgsql-general@xxxxxxxxxxxxxxxx> · Wed, 16 Nov 2005 18:52:25 +0200

I want to write a trigger that logs any changes that are made to a row. 
I have the old an new row values, but I am more interested in knowing if 
the update was absolute "UPDATE table SET col = 3" or relative "UPDATE 
table SET col = col + 2".
Is the a way (any way) to access this type of information ? In any 
language available (C, PLPGSQL, etc.)

Thanks
Razvan Radu

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