若按天计算每个客户的订单总金额，正确的SQL是________。[img=1101x418]17de922ac4b9078.png[/img] A: SELECT C_ID,COUNT(OrderPrice)FROM Orders GROUP BY C_ID,OrederDate B: SELECT OrderDate,C_ID,SUM(OrderPrice)FROM Orders GROUP BY OrderDate C: SELECT OrderDate,C_ID,SUM(OrderPrice)FROM Orders GROUP BY OrderDate,C_ID D: SELECT OrderDate,SUM(OrderAmount)FROM Orders GROUP BY OrderDate,C_ID