> A few days ago, I found that "CREATE OR REPLACE TRIGGER"
> is not allowed on 7.4.2. However, functions and rules allow
> "CREATE OR REPLACE" statement.
>
> Is threre any reason not to support "CREATE OR REPLACE"
> only for triggers?
Because the oid of a trigger doesn't matter. You can go being; drop
trigger; create trigger; commit; atomically.
Chris