Oracle object, nested table on a subtype

Question

Hello,
Is it possible to have a nested table on a subtype? If it is, can someone help me?
Here is what I need help for:
I have a supertype WORK, that have:
multivalued attribute ADDRESS
a attribute NAME, also the primary key
The subtype is called EMPLOYEE, that have:
multivalued attribute SPECIALTY
a attribute NAME
a attribute SSN
So far have I got:
//* The supertype *//
create or replace type ADRESS_TP as object(
ADRESS varchar2(50));
create or replace type ADRESSTP as table of ADRESS_TP;
create or replace WORK_TP as object(
NAME varchar2(30),
ADRESS ADRESSTP)
NOT FINAL;
create table WORK_TBL of WORK_TP(
Primary key(NAME))
nested table ADRESS store as NT_ADR(
(Primary key(nested_table_id, ADRESS))
organization index compress);
//* The subtype *//
create or replace type SPECIALTY_TP as object(
ADRESS varchar2(50));
create or replace type SPECIALTYTP as table of SPECIALTY_TP;
create or replace EMPLOYEE_TP under work_tp(
NAME varchar2(30),
SSN number)
FINAL;
The multivalued attribute SPECIALTYTP has to be declared in WORK_TBL have I been told, but how can I do that?
I'm using oracle 9i

Answer 1

I'm not really sure what your problem is. In future please be specific about what it is you are trying to do and what it is that is not working. If it's an error please give us the error message and number. It's not the behaviour you are expecting please describe what it does. If it's that you simply don't understand please say what you don't understand.
I go on like this because the code you have posted is somewhat confusing. The Oracle object-oriented implementation is not quite complete so that makes it hard for people who know OO but don't know Oracle. Whereas most of us who know Oracle aren't expert in OO. Also, I think you should be slightly more inventive in your names: there's so many things called ADRESS it's easy to get them tangled up.
Anyway, here's my guess at what I think your problem is....
SQL> CREATE OR REPLACE TYPE adress_t AS OBJECT(
  2  line1 VARCHAR2(50)
  3  ,line2 VARCHAR2(50)
  4  ,postcode VARCHAR2(8));
  5  /
Type created.
SQL>
SQL> CREATE OR REPLACE TYPE adress_nt AS TABLE OF adress_t;
  2  /
Type created.
SQL> CREATE OR REPLACE TYPE work_t AS OBJECT(
  2   name VARCHAR2(30),
  3   adresses adress_nt)
  4  NOT FINAL;
  5  /
Type created.
SQL> CREATE TABLE work_tbl OF work_t
  2     NESTED TABLE adresses STORE AS adress_ntab
  3  /
Table created.
SQL> CREATE OR REPLACE TYPE specialty_t AS OBJECT(
  2  description VARCHAR2(50));
  3  /
Type created.
SQL> CREATE OR REPLACE TYPE specialty_nt AS TABLE OF specialty_t;
  2  /
Type created.
SQL>
SQL> ALTER TYPE work_t ADD ATTRIBUTE specialities specialty_nt CASCADE
  2  /
Type altered.
SQL> DESC work_tbl
Name                                      Null?    Type
NAME                                               VARCHAR2(30)
ADRESSES                                           ADRESS_NT
SPECIALITIES                                       SPECIALTY_NT
SQL> Cheers, APC