SQL> DECLARE
2 TYPE nested_type IS TABLE OF NUMBER;
3 nt1 nested_type := nested_type(1,2,3);
4 nt2 nested_type := nested_type(3,2,1);
5 nt3 nested_type := nested_type(2,3,1,3);
6 nt4 nested_type := nested_type(1,2,4);
7 answer nested_type;
8 PROCEDURE show_answer (str IN VARCHAR2)
9 IS
10 l_row PLS_INTEGER;
11 BEGIN
12 DBMS_OUTPUT.put_line (str);
13 l_row := answer.FIRST;
14
15 WHILE (l_row IS NOT NULL)
16 LOOP
17 DBMS_OUTPUT.put_line (l_row || '=' || answer (l_row));
18 l_row := answer.NEXT (l_row);
19 END LOOP;
20
21 DBMS_OUTPUT.put_line ('');
22 END show_answer;
23 BEGIN
24 answer := nt1 MULTISET UNION nt4;
25 show_answer('nt1 MULTISET UNION nt4');
26 answer := nt1 MULTISET UNION nt3;
27 show_answer('nt1 MULTISET UNION nt3');
28 answer := nt1 MULTISET UNION DISTINCT nt3;
29 show_answer('nt1 MULTISET UNION DISTINCT nt3');
30 answer := nt2 MULTISET INTERSECT nt3;
31 show_answer('nt2 MULTISET INTERSECT nt3');
32 answer := nt2 MULTISET INTERSECT DISTINCT nt3;
33 show_answer('nt2 MULTISET INTERSECT DISTINCT nt3');
34 answer := SET(nt3);
35 show_answer('SET(nt3)');
36 answer := nt3 MULTISET EXCEPT nt2;
37 show_answer('nt3 MULTISET EXCEPT nt2');
38 answer := nt3 MULTISET EXCEPT DISTINCT nt2;
39 show_answer('nt3 MULTISET EXCEPT DISTINCT nt2');
40 END;
41 /
PL/SQL procedure successfully completed.