I have some triggers. They need to do stuff when a new row is inserted
or when the value of a particular field changes.
So, something like:
IF TG_OP='INSERT' OR NEW.foo != OLD.foo THEN
-- do stuff
END IF;
RETURN NEW;
Is there anything that guarantees that the NEW.foo != OLD.foo won't
be evaluated (and hence fail, as there is no OLD) on an insert?
Cheers,
Steve
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