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2025-09-29 14:43:44 +08:00
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leetcode-cn/problem (Chinese)/寻找用户推荐人 [find-customer-referee].html
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在 SQL 中，id 是该表的主键列。
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>
<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>
<p>找出以下客户的姓名：</p>
<ol>
<li><strong>被任何</strong>&nbsp;<code>id != 2</code>&nbsp;的用户推荐。</li>
<li><strong>没有被</strong>&nbsp;任何用户推荐。</li>
</ol>
<p>以 <strong>任意顺序</strong> 返回结果表。</p>