text: USE employees_DB;
  
  -- adds into the employee table
  INSERT INTO employee (id, first_name, last_name, role_id, manager_id)
  VALUES(1, "Eren", "Jager", 1, 4;
  
  INSERT INTO employee (id, first_name, last_name, role_id, manager_id)
  VALUES(2, "Mikasa", "Ackerman", 1,4);
  
  INSERT INTO employee (id, first_name, last_name, role_id, manager_id)
  VALUES(3, "Armin", "Alert", 2, 5;
  
  INSERT INTO employee (id, first_name, last_name, role_id, manager_id)
  VALUES(4, "Levi", "Ackerman", 3, 4);
  
  INSERT INTO employee (id, first_name, last_name, role_id, manager_id)
  VALUES(5, "Hange", "Zoe", 3, 5);
  
  -- adds into the role table
  INSERT INTO role (id, title, salary, department_id)
  VALUES (1, "Fighter", 50000, 1);
  
  INSERT INTO role (id, title, salary, department_id)
  VALUES (2, "Intellegence", 70000, 2);
  
  INSERT INTO role (id, title, salary, department_id)
  VALUES (3, "Comander", 150000, 2);
  
  -- add into department 
  INSERT INTO department (id, name)
  VALUES (1, "Combat");
  
  INSERT INTO department (id, name)
  VALUES (2, "strategy");
  
  