A named query is a SQL expression represented as a table. In a named query, you can specify an SQL expression to select rows and columns returned from one or more tables in one or more data sources.

What are named queries in JPA?

A named query is a predefined query that you create and associate with a container-managed entity (see “Using Annotations”). At deployment time, OC4J stores named queries on the EntityManager . At run time, you can use the EntityManager to acquire, configure, and execute a named query.

Why we use named queries?

Using named queries instead of dynamic queries may improve code organization by separating the JPQL query strings from the Java code. It also enforces the use of query parameters rather than embedding literals dynamically into the query string and results in more efficient queries.