请问：用一条SQL语句，查询每类货物的平均价格，并按平均价格逆序排列？表如下：

Id Type Price
1 A 100.00
2 C 80.00
3 A 130.00
4 B 90.00
5 B 100.00
6 C 120.00
7 A 90.00
8 C 90.00
9 B 80.00

select avg(t.Price) as avgpr, t.Type as Type from table t group by t.Type order by avgpr desc

参考自：
MySQL如何优化GROUP BY http://www.data.5helpyou.com/article237.html

 select avg(Price) as avgpr, Type from table group by Type order by avgpr desc