Inheritance in EJB query
If an 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.
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 executivesSELECT OBJECT(e) FROM EmpBean e
See AlsoEJB query language
Using EJB query