SQL>
SQL> DECLARE
2 A INTERVAL YEAR TO MONTH;
3 B INTERVAL YEAR TO MONTH;
4 C INTERVAL DAY TO SECOND;
5 D INTERVAL DAY TO SECOND;
6 BEGIN
7 A := INTERVAL '40-3' YEAR TO MONTH;
8 B := INTERVAL '40' YEAR;
9
10 END;
11 /
PL/SQL procedure successfully completed.
SQL>