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looping on NEW and OLD in a trigger

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Hi,

I'm very new to writing postgres procedures, and I'm trying to loop over
the fields in the NEW and OLD variables available in an after trigger,
and I can't quite get the syntax correct. 

Could someone point me at an example?

Thanks,
Mike
-- 
Michael P. Soulier <michael_soulier@xxxxxxxxx>, 613-592-2122 x2522
"Any intelligent fool can make things bigger and more complex... It takes a
touch of genius - and a lot of courage to move in the opposite direction."
--Albert Einstein

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