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.

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