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46 lines
1.0 KiB
HTML
46 lines
1.0 KiB
HTML
<p>表: <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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在 SQL 中，id 是该表的主键列。
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该表的每一行表示一个客户的 id、姓名以及推荐他们的客户的 id。</pre>
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<p>找出那些 <strong>没有被</strong> <code>id = 2</code> 的客户 <strong>推荐</strong> 的客户的姓名。</p>
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<p>以 <strong>任意顺序</strong> 返回结果表。</p>
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<p>结果格式如下所示。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre>
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<b>输入：</b>
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Customer 表:
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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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<b>输出：</b>
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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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+------+</pre>
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