Project Notes

Duplicate Emails

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Description

tab: English
 
<p>Table: <code>Person</code></p>
 
<pre>
+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| id          | int     |
| email       | varchar |
+-------------+---------+
id is the primary key (column with unique values) for this table.
Each row of this table contains an email. The emails will not contain uppercase letters.
</pre>
 
<p>&nbsp;</p>
 
<p>Write a solution to report all the duplicate emails. Note that it&#39;s guaranteed that the email&nbsp;field is not NULL.</p>
 
<p>Return the result table in <strong>any order</strong>.</p>
 
<p>The&nbsp;result format is in the following example.</p>
 
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
 
<pre>
<strong>Input:</strong> 
Person table:
+----+---------+
| id | email   |
+----+---------+
| 1  | a@b.com |
| 2  | c@d.com |
| 3  | a@b.com |
+----+---------+
<strong>Output:</strong> 
+---------+
| Email   |
+---------+
| a@b.com |
+---------+
<strong>Explanation:</strong> a@b.com is repeated two times.
</pre>
 
 
 
---
 
[submissions](https://leetcode.com/problems/duplicate-emails/submissions/) | [solutions](https://leetcode.com/problems/duplicate-emails/solutions/)
 
 
tab: 中文
 
<p><meta charset="UTF-8" /></p>
 
<p>表:&nbsp;<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>&nbsp;</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&nbsp;<strong>任意顺序&nbsp;</strong>返回结果表。</p>
 
<p>结果格式如下例。</p>
 
<p>&nbsp;</p>
 
<p><strong>示例&nbsp;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>
 
 
 
---
 
[提交记录](https://leetcode.cn/problems/duplicate-emails/submissions/) | [题解](https://leetcode.cn/problems/duplicate-emails/solution/)

Solutions & Notes

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Similar Problems

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