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小墨 提交于 2022-03-29 12:55 +08:00 . update
<p>Table: <code>Customers</code></p>
<pre>
+-------------+---------+
| Column Name | Type |
+-------------+---------+
| id | int |
| name | varchar |
+-------------+---------+
id is the primary key column for this table.
Each row of this table indicates the ID and name of a customer.
</pre>
<p>&nbsp;</p>
<p>Table: <code>Orders</code></p>
<pre>
+-------------+------+
| Column Name | Type |
+-------------+------+
| id | int |
| customerId | int |
+-------------+------+
id is the primary key column for this table.
customerId is a foreign key of the ID from the Customers table.
Each row of this table indicates the ID of an order and the ID of the customer who ordered it.
</pre>
<p>&nbsp;</p>
<p>Write an SQL query to report all customers who never order anything.</p>
<p>Return the result table in <strong>any order</strong>.</p>
<p>The query result format is in the following example.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<pre>
<strong>Input:</strong>
Customers table:
+----+-------+
| id | name |
+----+-------+
| 1 | Joe |
| 2 | Henry |
| 3 | Sam |
| 4 | Max |
+----+-------+
Orders table:
+----+------------+
| id | customerId |
+----+------------+
| 1 | 3 |
| 2 | 1 |
+----+------------+
<strong>Output:</strong>
+-----------+
| Customers |
+-----------+
| Henry |
| Max |
+-----------+
</pre>
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