# 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.

Parent topic: Programming trigger actions
Related concepts
Performing referential actions
Accessing before and after rows
Triggers and exceptions
Related reference
Examples of trigger actions