Examples of trigger actions This section provides some examples of triggers. Triggersexample of trigger actions

The following trigger action copies a row from the flights table into the flight_history table whenever any row gets inserted into flights and adds the comment "inserted from trig1" in the status column of the flight_history table.

CREATE TRIGGER trig1 AFTER UPDATE ON flights REFERENCING OLD AS UPDATEDROW FOR EACH ROW INSERT INTO flights_history VALUES (UPDATEDROW.FLIGHT_ID, UPDATEDROW.SEGMENT_NUMBER, UPDATEDROW.ORIG_AIRPORT, UPDATEDROW.DEPART_TIME, UPDATED ROW.DEST_AIRPORT, UPDATEDROW.ARRIVE_TIME, UPDATEDROW.MEAL, UPDATEDROW.FLYING_TIME, UPDATEDROW.MILES, UPDATEDROW.AIRCRAFT,'inserted from trig1');

The following trigger action updates the FlightAvailability table after an update of the flights table by setting the flight_id column to the value of the flight_id column in the modified row. The update of the FlightAvailability table happens only if the triggering update actually changed the value of FLIGHTS.FLIGHT_ID.

CREATE TRIGGER FLIGHTSUPDATE AFTER UPDATE ON flights REFERENCING OLD AS OLD NEW AS NEW FOR EACH ROW WHEN (OLD.FLIGHT_ID <> NEW.FLIGHT_ID) UPDATE FlightAvailability SET FLIGHT_ID = NEW.FLIGHT_ID WHERE FLIGHT_ID = OLD.FLIGHT_ID;