What proportion of orders are taken by the Sales Representative?
DIVIDE(COUNT(OrderID where Title = 'Sales Representative'), COUNT(OrderID)) as percentage;
SELECT CAST(COUNT(CASE WHEN T1.Title = 'Sales Representative' THEN 1 ELSE NULL END) AS REAL) * 100 / COUNT(T2.OrderID) FROM Employees AS T1 INNER JOIN Orders AS T2 ON T1.EmployeeID = T2.EmployeeID