题解 | #返回购买价格为 10 美元或以上产品的顾客列表#
从 Products 表中检索所有的产品名称以及对应的销售总数
http://www.nowcoder.com/practice/2b289b78de1546f38fd24e17e56f1bec
select prod_name, sum(quantity) as quant_sold
from Products , OrderItems
where Products.prod_id = OrderItems.prod_id
group by prod_name