Trigger action overview

A trigger action is a simple SQL statement.

For example:

CREATE TRIGGER . . .
DELETE FROM flightavailability 
	WHERE flight_id IN (SELECT flight_id FROM flightavailability 
		WHERE YEAR(flight_date) < 2005);) 

A trigger action does have some limitations, though; for example, it cannot contain dynamic parameters or alter the table on which the trigger is defined. See "TriggerAction" in the Derby Reference Manual for details.