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);

The trigger action includes not only the triggeredSQLStatement described in the "triggeredSQLStatement" section of the "CREATE TRIGGER statement" topic in the Derby Reference Manual, but also the [ FOR EACH { ROW | STATEMENT } ] clause and the WHEN clause.

A trigger action has limitations; for example, it cannot contain dynamic parameters or alter the table on which the trigger is defined. These limitations are detailed in the "triggeredSQLStatement" section of the "CREATE TRIGGER statement" topic in the Derby Reference Manual.