Multilevel nested table

Question

Does anyone know how to create a table with a column of a nested-table type with a nested-table element type?
I created a table with a column of a single-level nested-table type as follows:
create type MTYPE as object(
I NUMBER,
member function GETI return NUMBER,
member procedure SETI(V NUMBER));
create type TABTYPE as table of MTYPE;
create table TABTABLE(C1 TABTYPE)
nested table C1 store as TABTABLEC1;
But I could not create a table with a column of the following type:
create type TABTYPE2 as table of TABTYPE;
Is it not possible to do so? I do not know how to write the "nested table" and the "store as" parts in the "create table" statement.

Answer 1

Hi,
this is the example:
SQL> CREATE TYPE objtype AS OBJECT (ID NUMBER);
2 /
Type created.
SQL> CREATE TYPE objtype_tab AS TABLE OF objtype;
2 /
Type created.
SQL> CREATE TYPE objtype_cover AS OBJECT (nest objtype_tab)
2 /
Type created.
SQL> CREATE TYPE objtype_cover_tab AS TABLE OF objtype_cover
2 /
Type created.
SQL> CREATE TABLE obj_nest_table (
2 name VARCHAR2(10),
3 objs objtype_cover_tab)
4 NESTED TABLE objs STORE AS objs_tab
5 (NESTED TABLE nest STORE AS nest_tab)
6 /
SQL> insert into obj_nest_table values('A', objtype_cover_tab( objtype_cover (objtype_tab ( objtype(
200)))));
1 row created.
Rgds.