Inheritance in EJB query
If an Enterprise JavaBeans (EJB) inheritance hierarchy has been defined for an abstract schema, using the abstract schema name in a query statement implies the collection of objects for that abstract schema as well as all subtypes.
Example: Inheritance
Suppose that bean ManagerBean is
defined as a subtype of EmpBean and ExecutiveBean is
a subtype of ManagerBean in an EJB inheritance hierarchy.
The following query returns employees as well as managers and executives:
SELECT OBJECT(e) FROM EmpBean e