The Employee table has the following columns:

• ID - integer, primary key
• FirstName - variable-length string
• LastName - variable-length string
• ManagerID - integer

Write a SELECT statement to show a list of all employees' first names and their managers' first names. List only employees that have a manager. Order the results by Employee first name. Use aliases to give the result columns distinctly different names, like "Employee" and "Manager".

Hint: Join the Employee table to itself using INNER JOIN.