-- Write only the SQL statement that solves the problem and nothing else.
INSERT INTO employees(id, managerId, name) VALUES(3, 2, 'barbosa');

select (SELECT name FROM employees WHERE managerID IS NULL) as 'employee', (SELECT name FROM employees WHERE managerID IS NOT NULL) as 'manager'


-- Explanation:
-- In this example.
-- John is Mike's manager. Mike does not manage anyone.
-- Mike is the only employee who does not manage anyone.