Re: knowing which columns have beend UPDATEd inside a TRIGGER?

Louis-David Mitterrand <cunctator@apartia.ch> writes:
> Is there a way to know which columns are being UPDATEd or INSERTEd from
> inside a trigger, either in C or pl/pgsql?

Huh?  An INSERT always inserts all columns, by definition.  Some of them
might be null and/or equal to their default values, but they're all
there.

For an UPDATE, you could check to see whether old.col = new.col.
This would miss the case where an UPDATE command is explicitly setting
a column to the same value it already had; dunno if you care or not.
        regards, tom lane