Nested Tables - Oracle Crashes !

Question

Hello Everyone
You might help me to sleep tonight.
Ok, here is the problem.
I used a nested table to collect data. After collection, I get repeated records in collection result. I tried to operate to get a distinct result operating SQL operation but oracle gives nasty error and kicks me out the session.
HERE is the code :
create or replace package rule_engine
as
type t_course_count is table of number(2);
Procedure main;
end rule_engine;
create or replace package body rule_engine
as
procedure main
is
v_course_count t_course_count:=t_course_count(1,2,3,4);
i t_course_count;
begin
insert into table(i) select * from table(v_course_count);
end main;
end rule_engine;
null

Answer 1

Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
SQL> CREATE OR REPLACE TYPE table_type AS TABLE OF VARCHAR2 (8);
  2  /
Type created.
SQL> CREATE TABLE r(
  2    a INTEGER,
  3    b table_type)
  4    NESTED TABLE b STORE as b_1;
Table created.
SQL> CREATE TABLE s(
  2    a INTEGER,
  3    b table_type)
  4    NESTED TABLE b STORE as b_2;
Table created.
SQL> INSERT INTO r VALUES (1, table_type ('a', 'b'));
1 row created.
SQL> INSERT INTO s VALUES (1, table_type ('b', 'c'));
1 row created.
SQL> COLUMN c FORMAT A10;
SQL> SELECT r.a, r.b MULTISET UNION DISTINCT s.b c
  2  FROM   r, s
  3  WHERE  r.a = s.a;
         A C
         1 TABLE_TYPE('a', 'b', 'c')
SQL>