solution.md

# 查找重复的电子邮箱

<p>编写一个 SQL 查询，查找&nbsp;<code>Person</code> 表中所有重复的电子邮箱。</p>

<p><strong>示例：</strong></p>

<pre>+----+---------+
| Id | Email   |
+----+---------+
| 1  | a@b.com |
| 2  | c@d.com |
| 3  | a@b.com |
+----+---------+
</pre>

<p>根据以上输入，你的查询应返回以下结果：</p>

<pre>+---------+
| Email   |
+---------+
| a@b.com |
+---------+
</pre>

<p><strong>说明：</strong>所有电子邮箱都是小写字母。</p>


## template

```python


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## 答案

```python

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## 选项

### A

```python

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### B

```python

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### C

```python

```