You can access the rows in the object tables that are pointed to by REF column values using t REF() function; this function accepts a REF column as a parameter. : Object Reference Column « Object Oriented « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Object Oriented » Object Reference Column 
32. 8. 6. You can access the rows in the object tables that are pointed to by REF column values using t REF() function; this function accepts a REF column as a parameter.
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  /

Type created.

SQL>
SQL> CREATE Or Replace TYPE PersonType AS OBJECT (
  2    id         NUMBER,
  3    first_name VARCHAR2(10),
  4    last_name  VARCHAR2(10),
  5    dob        DATE,
  6    phone      VARCHAR2(12),
  7    address    AddressType
  8  )
  9  /

Type created.

SQL>
SQL> CREATE TABLE object_customers OF PersonType
  2  /

Table created.

SQL>
SQL> INSERT INTO object_customers VALUES (
  2    PersonType(1'John', 'White', '04-FEB-1945', '800-555-5555',
  3      AddressType('2 Ave', 'City', 'MA', '12345')
  4    )
  5  );

row created.

SQL>
SQL> INSERT INTO object_customers (
  2    id, first_name, last_name, dob, phone,
  3    address
  4  VALUES (
  5    2'James', 'Green', '05-FEB-1968', '800-555-4444',
  6    AddressType('3 Ave', 'Town', 'CA', '12345')
  7  );

row created.

SQL>
SQL> CREATE Or Replace TYPE ProductType AS OBJECT (
  2    id          NUMBER,
  3    name        VARCHAR2(15),
  4    description VARCHAR2(22),
  5    price       NUMBER(52),
  6    days_valid  NUMBER
  7  )
  8  /

Type created.

SQL>
SQL> CREATE TABLE object_products OF ProductType
  2  /

Table created.

SQL>
SQL> INSERT INTO object_products (
  2    id, name, description, price, days_valid
  3  VALUES (
  4    1'AAA', 'BBB', 2.995
  5  );

row created.

SQL>
SQL> CREATE TABLE purchases (
  2    id       NUMBER PRIMARY KEY,
  3    customer REF PersonType  SCOPE IS object_customers,
  4    product  REF ProductType SCOPE IS object_products
  5  );

Table created.

SQL>
SQL> INSERT INTO purchases (
  2    id,
  3    customer,
  4    product
  5  VALUES (
  6    1,
  7    (SELECT REF(ocFROM object_customers oc WHERE oc.id = 1),
  8    (SELECT REF(opFROM object_products  op WHERE op.id = 1)
  9  );

row created.

SQL>
SQL> select from purchases;

 ID  CUSTOMER                                                                     PRODUCT
-------------------------------------------------------------------------------------------------------------------------------------------------------------
  1  000022020861FDF674DA3D4B1088D187CB56924C27CD0C0B2EF27A4E5AB731BDCEE0BF1441   0000220208F8102DD78DC54DD0BB75E4AEA43E91BF05A396E7F9534DAE9CE3FE3F78872A74


SQL>
SQL> SELECT DEREF(customer), DEREF(product)
  2  FROM purchases;

DEREF(CUSTOMER)(ID, FIRST_NAME, LAST_NAME, DOB, PHONE, ADDRESS(STREET, CITY, STATE, ZIP))
-------------------------------------------------------------------------------------------
DEREF(PRODUCT)(ID, NAME, DESCRIPTION, PRICE, DAYS_VALID)
------------------------------------------------------------------------------------------
PERSONTYPE(1'John', 'White', '04-FEB-45', '800-555-5555', ADDRESSTYPE('2 Ave', 'City', 'MA', '12345'))
PRODUCTTYPE(1'AAA', 'BBB', 2.995)


SQL>
SQL> drop table purchases;

Table dropped.

SQL>
SQL> drop table object_products;

Table dropped.

SQL>
SQL> drop table object_customers;

Table dropped.

SQL>
SQL> drop type persontype;

Type dropped.

SQL> drop type addresstype;

Type dropped.

SQL>
32. 8. Object Reference Column
32. 8. 1. Object References and Object Identifiers
32. 8. 2. CREATE a Table that References Our Row Objects
32. 8. 3. Inserting a Row into the Object Reference table
32. 8. 4. You can access this object identifier using the REF() function and store the returned objectifier in a REF column.
32. 8. 5. Selecting a Row from the Object reference table
32. 8. 6. You can access the rows in the object tables that are pointed to by REF column values using t REF() function; this function accepts a REF column as a parameter.
32. 8. 7. Updating a Row in the object reference table
32. 8. 8. Reference column
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