*LeetCode Mysql 查找從來不購買的客戶

Customers:

Id	Name
1	Joe
2	Henry
3	Sam
4	Max

Orders:

Id	CustomerId
1	3
2	1

Q:

• 根據Customers 和 Orders 表查找出從來沒有發生購買行爲的人

A:

select customers.name as "Customers"
from customers
where customers.id not in (
    select customerid from orders
);