examples of Cursor FOR Loop in oracle

e.g.
SET SERVEROUTPUT ON
BEGIN
   FOR trip_record IN (SELECT bt_id_pk, bt_duration
                      FROM business_trips) LOOP
      -- implicit open/fetch occurs
      IF trip_record.bt_duration = 1 THEN
        DBMS_OUTPUT_LINE ('trip Number ' || trip_record.bt_id_pk
                        || ' is a one day trip');
      END IF;
   END LOOP; -- implicit CLOSE occurs
END;
/