某網站包含兩個表,Customers 表和 Orders 表。編寫一個 SQL 查詢,找出所有從不訂購任何東西的客戶。
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,你的查詢應返回:
+-----------+
| Customers |
+-----------+
| Henry |
| Max |
+-----------+
來源:力扣(LeetCode)
鏈接:https://leetcode-cn.com/problems/customers-who-never-order
select Name Customers
from Customers
where Id NOT IN (select distinct CustomerId from Orders);