LeetCode（数据库）- 从不订购的客户

Posted 2021-05-19 Lux_Sun

题目链接：点击打开链接

 

题目大意：略。

 

解题思路：略。

 

AC 代码

-- 解决方案(1)
SELECT Name AS Customers
FROM Customers c
LEFT JOIN Orders o
ON c.Id = CustomerId
WHERE CustomerId IS NULL

-- 解决方案(2)
SELECT Name AS Customers
FROM Customers c
WHERE c.Id NOT IN(SELECT CustomerId FROM Orders);