Spring Data JPA - Get All Unique Values in Column

Question

I have a project using Spring Data JPA that consumes data from a table full of addresses. One of the columns of this table is the city. I would like to get a distinct list o

Answer 1

This can be achieved using the @Query annotation as:

public interface AddressRepository extends CrudRepository {
    @Query("SELECT DISTINCT a.city FROM Address a")
    List findDistinctCity();
}

Then, a call to addressRepository.findDistinctCity() would return the distinct city names.

A sample application is available on Github for review. Run integration test as mvn clean test to verify the approach.