15. HQL and JPQL

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The Hibernate Query Language (HQL) and Java Persistence Query Language (JPQL) are both object model focused query languages similar in nature to SQL.
JPQL is a heavily-inspired-by subset of HQL.
A JPQL query is always a valid HQL query, the reverse is not true however.

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Both HQL and JPQL are non-type-safe ways to perform query operations.
Criteria queries offer a type-safe approach to querying.  See [Criteria](#criteria) for more information.

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