Triggers and "FOR EACH ROW"

[Mihamina Rakotomandimby]

Manao ahoana, Hello, Bonjour,

I just read several documentation on MySQL triggers.
The way to create triggers is:
CREATE TRIGGER t21_au
 BEFORE UPDATE ON t22
 FOR EACH ROW
 BEGIN
 // ...
 END;

The trigger I want is only on UPDATE.

Is "FOR EACH ROW" referring to "each existing row in the table", or to
"each UPDATEd row"?

Misaotra, Thanks, Merci.

-- 

       Architecte Informatique chez Blueline/Gulfsat:
    Administration Systeme, Recherche & Developpement
                                    [phone]