DataJPA/src/main/kotlin/com/chantha/jdbc/jpa/repo/CustomerRepo.java

package com.chantha.jdbc.jpa.repo;

import com.chantha.jdbc.jpa.model.Customer;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;

public interface CustomerRepo extends CrudRepository<Customer,Long> {
    @Query(value ="SELECT * FROM tb_customer c INNER JOIN tb_order o ON (c.id=o.cus_id)",nativeQuery = true)
    @Override
    Iterable<Customer> findAll();
}