I'm trying to write some code in a trigger that fires on both an insert
and an update.
At one point I need to update a column either on an insert or if the
value of the column has changed.
The following code fails because the OLD value is not defined:
if TG_OP = ''INSERT''
or (TG_OP = ''UPDATE'' and NEW.column1 != coalesce(OLD.column1,''--'')) then
column2 := ''CHANGED'';
end if;
Shouldn't OLD.column1 not even be evaluated when the other if statement in
the group in parentheses is false or when the earlier if statement is true?
Is there a way around this other than separating the code into two
independent if statements, duplicating the action statements?
--
Mike Nolan
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