一凄鼻、題目
Customers Who Never Order
二腊瑟、個人思考
1）乍眼一看不難聚假，但是陷阱在答案還替換了表名，最基本的答案是按照題目的邏輯走：
select Customers.Name as Customers from Customers where Id not in (select distinct CustomerId from Orders);
2）表名的修改也可以這個樣子改
select Name Customers from Customers where id not in (select DISTINCT CustomerId from Orders);
