Oracle PL/SQL Tutorial/System Tables Data Dictionary/user nested tables

Get information on your nested tables from the user_nested_tables view

SQL>
SQL> desc user_nested_tables;
 Name          Null?    Type
 TABLE_NAME             VARCHAR2(30)    Name of the nested table                                          
 TABLE_TYPE_OWNER       VARCHAR2(30)    User who owns the nested table type                               
 TABLE_TYPE_NAME        VARCHAR2(30)    Name of the nested table type                                     
 PARENT_TABLE_NAME      VARCHAR2(30)    Name of the parent table that contains the nested table           
 PARENT_TABLE_COLUMN    VARCHAR2(4000)  Name of the column in the parent table containing the nested table
 STORAGE_SPEC           VARCHAR2(30)    Storage specification for the nested table                        
 RETURN_TYPE            VARCHAR2(20)    Return type of the column                                         
 ELEMENT_SUBSTITUTABLE  VARCHAR2(25)
SQL> CREATE Or Replace TYPE AddressType AS OBJECT (
  2    street VARCHAR2(15),
  3    city   VARCHAR2(15),
  4    state  CHAR(2),
  5    zip    VARCHAR2(5)
  6  );
  7  /
SQL>
SQL> CREATE Or Replace TYPE nested_table_AddressType AS TABLE OF AddressType;
  2  /
Type created.
SQL>
SQL> CREATE TABLE employee (
  2    id         INTEGER PRIMARY KEY,
  3    first_name VARCHAR2(10),
  4    last_name  VARCHAR2(10),
  5    addresses  nested_table_AddressType
  6  )
  7  NESTED TABLE
  8    addresses
  9  STORE AS
 10    nested_addresses;
Table created.
SQL>
SQL>
SQL> --SELECT * FROM user_nested_tables;
SQL>
SQL>
SQL> drop table employee;
Table dropped.
SQL>
SQL>