Departments With at Least One Employee

Return the names of departments that have at least one employee, without returning a department more than once. Order by name.

Table schema

Departments(id INT PRIMARY KEY, name VARCHAR(50))
Employees(id INT PRIMARY KEY, department_id INT)

Sample data

Departments: (1, Eng), (2, HR), (3, Legal)
Employees department_ids: 1, 1, 2