SQL LeetCode: 183. Customers Who Never Order
Apr 1, 2021
183. Customers Who Never Order
Easy
SQL Schema
Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never order anything.
Table: Customers.
+----+-------+
| Id | Name |
+----+-------+
| 1 | Joe |
| 2 | Henry |
| 3 | Sam |
| 4 | Max |
+----+-------+Table: Orders.
+----+------------+
| Id | CustomerId |
+----+------------+
| 1 | 3 |
| 2 | 1 |
+----+------------+Using the above tables as example, return the following:
+-----------+
| Customers |
+-----------+
| Henry |
| Max |
+-----------+SELECT
Name as Customers
FROM
Customers
WHERE Id NOT IN (SELECT distinct customerId FROM Orders )
