Dear Jack ,
>for each column in new:
> if (new.column(1) != old.column(1)) ...
>
> ...and then some snippet of code to determine the primary key column
>of new (or old)
>
>
Check the following link
http://gborg.postgresql.org/project/tablelog/projdisplay.php
Hope this helps
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Vishal Kashyap
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