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49 lines
1.1 KiB
HTML
49 lines
1.1 KiB
HTML
<p>Table: <code>Customer</code></p>
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<pre>
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+-------------+---------+
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| Column Name | Type |
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+-------------+---------+
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| id | int |
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| name | varchar |
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| referee_id | int |
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+-------------+---------+
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id is the primary key column for this table.
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Each row of this table indicates the id of a customer, their name, and the id of the customer who referred them.
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</pre>
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<p> </p>
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<p>Write an SQL query to report the IDs of the customer that are <strong>not referred by</strong> the customer with <code>id = 2</code>.</p>
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<p>Return the result table in <strong>any order</strong>.</p>
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<p>The query result format is in the following example.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong>
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Customer table:
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+----+------+------------+
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| id | name | referee_id |
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+----+------+------------+
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| 1 | Will | null |
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| 2 | Jane | null |
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| 3 | Alex | 2 |
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| 4 | Bill | null |
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| 5 | Zack | 1 |
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| 6 | Mark | 2 |
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+----+------+------------+
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<strong>Output:</strong>
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+------+
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| name |
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+------+
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| Will |
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| Jane |
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| Bill |
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| Zack |
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+------+
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</pre>
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