mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-11-04 19:53:12 +08:00
45 lines
982 B
HTML
45 lines
982 B
HTML
<p><meta charset="UTF-8" /></p>
|
|
|
|
<p>表: <code>Person</code></p>
|
|
|
|
<pre>
|
|
+-------------+---------+
|
|
| Column Name | Type |
|
|
+-------------+---------+
|
|
| id | int |
|
|
| email | varchar |
|
|
+-------------+---------+
|
|
id 是该表的主键（具有唯一值的列）。
|
|
此表的每一行都包含一封电子邮件。电子邮件不包含大写字母。
|
|
</pre>
|
|
|
|
<p> </p>
|
|
|
|
<p>编写解决方案来报告所有重复的电子邮件。 请注意，可以保证电子邮件字段不为 NULL。</p>
|
|
|
|
<p>以 <strong>任意顺序 </strong>返回结果表。</p>
|
|
|
|
<p>结果格式如下例。</p>
|
|
|
|
<p> </p>
|
|
|
|
<p><strong>示例 1:</strong></p>
|
|
|
|
<pre>
|
|
<strong>输入:</strong>
|
|
Person 表:
|
|
+----+---------+
|
|
| id | email |
|
|
+----+---------+
|
|
| 1 | a@b.com |
|
|
| 2 | c@d.com |
|
|
| 3 | a@b.com |
|
|
+----+---------+
|
|
<strong>输出:</strong>
|
|
+---------+
|
|
| Email |
|
|
+---------+
|
|
| a@b.com |
|
|
+---------+
|
|
<strong>解释:</strong> a@b.com 出现了两次。</pre>
|