Spring Data Jpa支持使用`first`、`top`以及`Distinct` 关键字来限制查询结果。 ```java public interface UserRepository extends JpaRepository<User, Integer> , JpaSpecificationExecutor<User> { User findFirstByOrderByLastnameAsc(); User findTopByOrderByAgeDesc(); Page<User> queryFirst10ByLastname(String lastname, Pageable pageable); Slice<User> findTop3ByLastname(String lastname, Pageable pageable); List<User> findFirst10ByLastname(String lastname, Sort sort); List<User> findTop10ByLastname(String lastname, Pageable pageable); User findDistinctByUsername(String username); } ```