$/**$

$*$ This class will navigate you through the process of writing your own custom queries in a JpaRepository, using

$*$ Spring's query language, JPQL$.$ JPQL has the advantage of not only abstracting away boilerplate logic by directly

$*$ mapping queries to your ORM entities, but is also vendor$-$agnostic $-$ meaning that your JPQL query does not change

$*$ between, for example, using an actual PostgresSQL, Oracle, or MySQL database.

$*/$

public interface PetRepository extends JpaRepository $\{$