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.
