有两个数据表City表和Price表，CIty表的结构如下：
Price表的结构如下：
查询每个城市最大的销售价格，并以最大价格进行降序排列，选取前5条记录，SQL语句的代码如下：
select top 5 * from (select ROW_NUMBER() over(order by TmpTable.AdultyPrice desc) NID, City.*, TmpTable.AdultyPrice from City,(select MAX(Price.AdultyPrice) as AdultyPrice,PID from City inner join Price on City.LID = Price.PID group by Price.PID) as TmpTable where LID = PID) as tmp
运行结果：
