List By Biggest_Purchase In Desc Order In Group By Query

Question

以下是我的疑问：

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;

为什么我收到以下错误？：

Msg 8127，Level 16，State 1，Line 5 ORDER BY子句中的“orders.amount”列无效，因为它不包含在聚合函数或GROUP BY子句中。

Answer 1

您只能在select的{​​{1}}子句中指定列。我想你的意思是：

order by

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;