GROUP BY и ORDER BY

SELECT Customer, OrderDate, OrderPrice FROM Orders where Customer = '{$customer_name}' ORDER BY OrderDate DESC

        select
            Customer, OrderDate, OrderPrice
        from
            Orders Orders1
        where
            Orders1.OrderDate=(SELECT MAX(Orders2.OrderDate) FROM Orders Orders2 WHERE 
                Orders1.Customer=Orders2.Customer, 
                Orders1.OrderDate=Orders2.OrderDate, 
                Orders1.OrderPrice=Orders2.OrderPrice
                and Orders2.OrderDate<= '.$where_date.'
                )