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Oracle® Database SQL Language Reference
11g Release 2 (11.2)

Part Number E10592-02
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OBJECT_ID Pseudocolumn

The OBJECT_ID pseudocolumn returns the object identifier of a column of an object table or view. Oracle uses this pseudocolumn as the primary key of an object table. OBJECT_ID is useful in INSTEAD OF triggers on views and for identifying the ID of a substitutable row in an object table.

Note:

In earlier releases, this pseudocolumn was called SYS_NC_OID$. That name is still supported for backward compatibility. However, Oracle recommends that you use the more intuitive name OBJECT_ID.

See Also:

Oracle Database Object-Relational Developer's Guide for examples of the use of this pseudocolumn