public class Employee {
    int id;
    String name;
    int departament_id;
    double salary;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getDepartament_id() {
        return departament_id;
    }

    public void setDepartament_id(int departament_id) {
        this.departament_id = departament_id;
    }

    public double getSalary() {
        return salary;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }

SELECT
	e.departament_id,
	SUM (e.salary)
FROM
	employee AS e
GROUP BY
	e.departament_id