Using a Nested Table Type to Define a Column in a Table : Nested Table Column « Collections « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Collections » Nested Table Column 
26. 9. 1. Using a Nested Table Type to Define a Column in a Table

Once you have defined your nested table type, you can use it to define a column in a table.

The NESTED TABLE clause identifies the name of the nested table column (addresses).

The STORE AS clause specifies the name of the actual nested table (nested_addresses).

You cannot access the nested table independently of the table in which it is embedded.

SQL>
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> desc employee;
 Name           Null?    Type

 ID             NOT NULL NUMBER(38)
 FIRST_NAME              VARCHAR2(10)
 LAST_NAME               VARCHAR2(10)
 ADDRESSES               NESTED_TABLE_ADDRESSTYPE
   STREET                VARCHAR2(15)
   CITY                  VARCHAR2(15)
   STATE                 CHAR(2)
   ZIP                   VARCHAR2(5)

SQL>
SQL> drop table employee;

Table dropped.
26. 9. Nested Table Column
26. 9. 1. Using a Nested Table Type to Define a Column in a Table
26. 9. 2. Getting Information on Nested Tables
26. 9. 3. Set the depth to 2 and describe a nested table
26. 9. 4. Populating a Nested Table with Elements
26. 9. 5. Selecting Nested Table Elements
26. 9. 6. Modifying Nested Table Elements
26. 9. 7. Update the first record in the nested table.
26. 9. 8. Delete one record in the nested table
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