EMPTY collection predicate

To test if a multivalued relationship is empty, use the following syntax: 

collection-valued-path-expression  IS [NOT]  EMPTY

Example: Empty collection predicate

To find all departments with no employees: 

SELECT OBJECT(d) FROM DeptBean d  WHERE  d.emps IS EMPTY

Related concepts
EJB query language
WHERE clause
Related tasks
Using EJB query