某網(wǎng)站包含兩個(gè)表，Customers 表和 Orders 表。編寫一個(gè) SQL 查詢，找出所有從不訂購(gòu)任何東西的客戶。
Customers 表：

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

Orders 表：

+----+------------+
| Id | CustomerId |
+----+------------+
| 1  | 3          |
| 2  | 1          |
+----+------------+

例如給定上述表格，你的查詢應(yīng)返回：

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

答案：

select name customers from customers 
where id not in (select CustomerId from Orders );