DEREF returns the object reference of argument expr, where expr must return a REF to an object. If you do not use this function in a query, then Oracle Database returns the object ID of the REF instead, as shown in the example that follows.
The sample schema oe contains an object type cust_address_typ. The REF Constraint Examples create a similar type, cust_address_typ_new, and a table with one column that is a REF to the type. The following example shows how to insert into such a column and how to use DEREF to extract information from the column:
INSERT INTO address_table VALUES
('1 First', 'G45 EU8', 'Paris', 'CA', 'US');
INSERT INTO customer_addresses
SELECT 999, REF(a) FROM address_table a;
SELECT address
FROM customer_addresses
ORDER BY address;
ADDRESS
--------------------------------------------------------------------------------
000022020876B2245DBE325C5FE03400400B40DCB176B2245DBE305C5FE03400400B40DCB1
SELECT DEREF(address)
FROM customer_addresses;
DEREF(ADDRESS)(STREET_ADDRESS, POSTAL_CODE, CITY, STATE_PROVINCE, COUNTRY_ID)
--------------------------------------------------------------------------------
CUST_ADDRESS_TYP_NEW('1 First', 'G45 EU8', 'Paris', 'CA', 'US')
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