Question

I’m creating types this way:

CREATE OR REPLACE TYPE t_type1 AS OBJECT
(
  -- fields
);

CREATE OR REPLACE TYPE t_user AS OBJECT
(
  -- fields  
) NOT FINAL;

CREATE OR REPLACE TYPE t_type2 AS TABLE OF t_type1;

CREATE OR REPLACE TYPE t_superuser UNDER t_user
(
  -- fields
  field t_type2
);

The error arises on executing “CREATE OR REPLACE TYPE t_type2 AS TABLE OF t_type1;” – it return syntax error. Therefore I can’t complete the last statement.

Answer 1

This construct CREATE OR REPLACE TYPE othertype ( field typetable ) is semantically incorrect.
You create your first type as follows :

SQL>  CREATE OR REPLACE TYPE typetable AS TABLE OF number; -- for example 
  2  /

Type created

And a second one as follows:

SQL> CREATE OR REPLACE TYPE othertype as table of typetable;
  2  /

Type created

Or if you would like to create an object type:

SQL> create or replace type othertype as object
  2  (
  3    field typetable
  4  )
  5  /

Type created