text: use employees_db;
  INSERT INTO department
      (name)
  VALUES
      ('IT'),
      ('Marketing'),
      ('HR'),
      ('Facilities');
  
  INSERT INTO role 
      (title, salary, department_id)
  VALUES
      ('Copywriter', 80000, 1),
      ('DevOps', 100000, 2),
      ('Recruiter', 800000, 3),
      ('Maintenance', 60000, 4);
  
  INSERT INTO employee
      (first_name, last_name, role_id, manager_id)
  VALUES
  	('John', 'Doe',1,NULL),
      ('Jane', 'Doe',2,NULL),
      ('Bo', 'Bob', 4, NULL),
      ('Joe', 'Jo', 3, NULL)