DECLARE
  CURSOR CEgzaminy IS SELECT DISTINCT DATA_EGZ
                      FROM EGZAMINY
                      ORDER BY DATA_EGZ DESC;
  vData CEgzaminy%ROWTYPE;
BEGIN
  OPEN CEgzaminy;
  IF CEgzaminy%ISOPEN
  THEN
    FETCH CEgzaminy INTO vData;
    WHILE CEgzaminy%FOUND AND CEgzaminy%ROWCOUNT <= 3 LOOP
      DBMS_OUTPUT.PUT_LINE(vData.DATA_EGZ);
      FETCH CEgzaminy INTO vData;
    END LOOP;
    CLOSE CEgzaminy;
  END IF;
END;