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183. customers who never order

admin 11月 15, 2020 0

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.

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

Table: Orders.

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+----+------------+
| Id | CustomerId |
+----+------------+
| 1  | 3          |
| 2  | 1          |
+----+------------+
 
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# Write your MySQL query statement below
select C.Name Customers from Customers C left join Orders O on C.Id = O.CustomerId where O.CustomerId is null
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