数据库

[LeetCode] 182. Duplicate Emails_Easy tag: SQL

云博小周宇1 Min Read

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