sql - 按查询分组按 Desc 顺序列出 Biggest_Purchase

Question

以下是我的查询：

select MAX(o.amount)as Biggest_Purchase , c.cust_fname, c.cust_lname 
from orders o, customer c
where o.cust_num = c.cust_num
group by c.cust_fname, c.cust_lname
order by o.amount desc;

为什么我会收到以下错误？：

消息 8127，级别 16，状态 1，第 5 行列“orders.amount”在 ORDER BY 子句中无效，因为它不包含在聚合函数或 GROUP BY 子句中。

Answer 1

您只能select在order by. 我想你的意思是：

select MAX(o.amount)as Biggest_Purchase , c.cust_fname, c.cust_lname 
from orders o, customer c
where o.cust_num = c.cust_num
group by c.cust_fname, c.cust_lname
order by Biggest_Purchase desc;

Answer 2

select MAX(o.amount)as Biggest_Purchase , c.cust_fname, c.cust_lname 
from orders o, customer c
where o.cust_num = c.cust_num
group by c.cust_fname, c.cust_lname
order by max(o.amount) desc;