(SQL)183. 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
 

题解:通过子查询AC的,简单题

select 
      Customers.Name as Customers
from 
      Customers
where
      Customers.id
not in
      (select Orders.CustomerId from Orders);

 

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