用户还可以部署XQuery来检索那些评价最好且单价低于平均价格的计算机图书。
Users can also employ XQuery to retrieve the list of computer books that have the best reviews and are cheaper than the average price.
你平时在学校最常买的饮料的平均单价是多少？
What is the average unit price for the drink you buy most on the campus?
位于苏夫斯的研究机构Dmitry Samosseiko是销售安全设备的，去年，这个机构发现平均每份药品的订单价值为200美元。
Last year Dmitry Samosseiko, a researcher at Sophos, which sells computer-security equipment, found that the average value of an order was $200.
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