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[LeetCode] 182. Duplicate Emails_Easy tag: SQL

时间:2018-08-18 12:12:11      阅读:134      评论:0      收藏:0      [点我收藏+]

Write a SQL query to find all duplicate emails in a table named Person.

+----+---------+
| Id | Email   |
+----+---------+
| 1  | a@b.com |
| 2  | c@d.com |
| 3  | a@b.com |
+----+---------+

For example, your query should return the following for the above table:

+---------+
| Email   |
+---------+
| a@b.com |
+---------+

Note: All emails are in lowercase.

 

 

Code

SELECT Email from Person GROUP BY Email HAVING count(Email) > 1

 

[LeetCode] 182. Duplicate Emails_Easy tag: SQL

原文:https://www.cnblogs.com/Johnsonxiong/p/9496602.html

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