La columna de UnitPrice, Quantity, Discount se encuentran en una tabla llamada orderdetails con llave primaria OrderID
Ayuda
Código
SELECT C.ContactName, O.OrderID, CONCAT (FirstName,' ',LastName) AS Employee, O.OrderDate, O.RequiredDate, O.ShippedDate /*, Max((SUM((Od.UnitPrice*Od.Quantity)*(1-Od.Discount)))), Min((SUM((Od.UnitPrice*Od.Quantity)*(1-Od.Discount))))'Total de Orden' */ FROM Customers C INNER JOIN Orders O ON C.CustomerID = O.CustomerID INNER JOIN Employees E ON O.EmployeeID=E.EmployeeID /*INNER JOIN OrderDetails Od ON O.OrderID=Od.OrderID */ WHERE C.ContactName = 'Ana Trujillo'