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24 lines
482 B
HTML
24 lines
482 B
HTML
<p>编写一个 SQL 查询，查找 <code>Person</code> 表中所有重复的电子邮箱。</p>
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<p><strong>示例：</strong></p>
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<pre>+----+---------+
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| Id | Email |
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+----+---------+
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| 1 | a@b.com |
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| 2 | c@d.com |
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| 3 | a@b.com |
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+----+---------+
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</pre>
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<p>根据以上输入，你的查询应返回以下结果：</p>
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<pre>+---------+
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| Email |
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+---------+
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| a@b.com |
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+---------+
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</pre>
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<p><strong>说明：</strong>所有电子邮箱都是小写字母。</p>
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