These functions can be used to return a single result, or can be used with a GROUP BY to return multiple results. createQuery ( Select e.firstName, e.lastName FROM Employee e ). createQuery ( Select e.firstName FROM Employee e ). createQuery ( Select e FROM Employee e WHERE e.id:id ). createQuery ( Select e FROM Employee e WHERE e.salary 100000 ). Select queries can return a single object or data element, a list of objects or data elements, or an object array of multiple objects and data. JPQL can be used in a NamedQuery (through annotations or XML) or in dynamic queries using the EntityManager createQuery() API.
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December 2022
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