SQL> DECLARE
2 TYPE courseList IS VARRAY(3) OF varchar2(25);
3 cl courseList;
4 BEGIN
5 cl := null;
6 cl := courseList();
7 cl := courseList('CS 111','CS 436');
8 cl := courseList('CS 111',NULL,'CS 436');
9 END;
10 /
PL/SQL procedure successfully completed.
SQL>