A . select CustomerName，SalesDate from Sales group by CustomerName，SalesDate
B . select CustomerName，SalesDate from Sales order by CustomerName，SalesDate
C . select CustomerName，SalesDate from Sales group by CustomerNameorderbySalesDateDESC
D . select CustomerName，SalesDate from Sales order by CustomerName，SalesDateDESC
答案不对？请尝试站内搜索