实验16-09 请在testdb中:查询既订购了“16M DRAM”商品...

testdb是产品销售数据库，请在testdb中:查询既订购了“16M DRAM”商品，又订购了“1.2GB硬盘”商品的客户编号、订单编号和订单金额。

select distinct cust_id,b.order_no,tot_amt
from sales b,product a,sale_item c
where a.Prod_id=c.Prod_id and b.Order_No = c.Order_No and Prod_Name = '16M DRAM' and
b.Order_No in
(
select b.Order_No
from Product a,sales b,sale_item c
where  b.Order_No = c.Order_No and a.Prod_id=c.Prod_id and Prod_Name = '1.2GB硬盘'
)