Querying Nested Tables with Multiple other Tables

Question

I am trying to query columns from a table and it's nested table and do a join to another table.
SELECT IM.*,
IMP.PROGRAM_ID,
S.STAGE_NAME
FROM TB_ITEM_MASTER IM , TABLE(TB_ITEM_MASTER.PROGRAMS) IMP, TB_STAGE S
WHERE S.STAGE_ID = IM.STAGE_ID
AND IM.PROGRAM_ID IN(1,2);
When running this query I receive the error:
ORA-00904:"TB_ITEM_MASTER"."PROGRAMS": Invalid Identifier
I actually copied this query straight from an Oracle Documentation, just replaced my table names with theirs. This query will almost be like a template to me as the program_id field in the Nested table is very cruicial to me. I will joining many tables to TB_ITEM_MASTER and using the where clause against program_id. What's the problem here?
Please advise.
ps. Did I mention how much I hate working with this Nested table stuff:(

Answer 1

You must use the alias name, not the table name.
SQL> create type employee_obj as object (empno number) ;
  2  /
Type created.
SQL> create type employees_nt is table of employee_obj ;
  2  /
Type created.
SQL> create table departments (deptno number(2), dname varchar2(20), employees employees_nt)
  2  nested table employees store as employees_table
  3  /
Table created.
SQL> insert into departments values (1, 'DEPT #1', employees_nt(employee_obj(2), employee_obj(3))) ;
1 row created.
SQL> insert into departments values (22, 'DEPT #2', employees_nt(employee_obj(22), employee_obj(33))) ;
1 row created.
SQL>
SQL> SELECT IM.*,
  2  IMP.empno
  3  FROM departments IM , TABLE(IM.employees) IMP
  4  WHERE IM.deptno IN(1,2);
    DEPTNO DNAME
EMPLOYEES(EMPNO)
     EMPNO
         1 DEPT #1
EMPLOYEES_NT(EMPLOYEE_OBJ(2), EMPLOYEE_OBJ(3))
         2
         1 DEPT #1
EMPLOYEES_NT(EMPLOYEE_OBJ(2), EMPLOYEE_OBJ(3))
         3
2 rows selected.
SQL>