>> A trigger FOR EACH STATEMENT will execute the trigger function
>> for each row affacted by the statement.
>
> Huh? That would be true for a FOR EACH ROW trigger, but a STATEMENT
> trigger fires once per statement.
Argh. I intended to write FOR EACH ROW.
Thanks for the correction.
>> A rule would only
>> execute one additional statement. So if you can do it with a rule
>> conveniently, the rule will probably be faster.
>
> I find this unlikely. The overhead involved in setting up a rule
> is probably larger than that involved in calling a trigger.
> The real question is whether you need access to the modified data
> or not --- a statement-level trigger doesn't currently get that.
Yes, I meant to write about row level triggers, maybe what
I wrote makes more sense then...
What I said was inspired by chapter 35.6. of the documentation.
Yours,
Laurenz Albe