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30 lines
662 B
HTML
30 lines
662 B
HTML
<p>给定表 <code>customer</code> ，里面保存了所有客户信息和他们的推荐人。</p>
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<pre>
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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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</pre>
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<p>写一个查询语句，返回一个客户列表，列表中客户的推荐人的编号都 <strong>不是 </strong>2。</p>
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<p>对于上面的示例数据，结果为：</p>
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<pre>
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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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