Lc183-从不订购的客户

某网站包含两个表，Customers 表和 Orders 表。编写一个 SQL 查询，找出所有从不订购任何东西的客户。

Customers 表：

+----+-------+
| Id | Name  |
+----+-------+
| 1  | Joe   |
| 2  | Henry |
| 3  | Sam   |
| 4  | Max   |
+----+-------+
Orders 表：

+----+------------+
| Id | CustomerId |
+----+------------+
| 1  | 3          |
| 2  | 1          |
+----+------------+
例如给定上述表格，你的查询应返回：

+-----------+
| Customers |
+-----------+
| Henry     |
| Max       |
+-----------+

来源：力扣（LeetCode）
链接：https://leetcode-cn.com/problems/customers-who-never-order
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# Write your MySQL query statement below
select  name as Customers from customers
where not exists (
    select 1  from orders
    where customers.id = orders.CustomerId 

)

# not in