SQL牛客刷题一直不通过

各位帮忙看一下，这段代码哪里有问题？

select vend_id,prod_price as cheaptest_item
from
     (select vend_id,prod_price,
     row_number() over(partition by vend_id order by prod_price) as ra 
     from Products) as Prod
where ra=1
order by cheaptest_item;

题目如下：

在牛客网上自测运行出来的结果和预期一致，但是保存提交一直不通过

1、题目中要求输出的字段为：cheapest_item，而你输出的是：cheaptest_item

SELECT vend_id,MIN(prod_price) AS cheaptest_item 
FROM Products
GROUP BY vend_id
ORDER BY cheaptest_item