[LeetCode] Duplicate Emails

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.

# Write your MySQL query statement below
SELECT Email FROM Person GROUP BY Email HAVING COUNT(Email) > 1;
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[LeetCode] Duplicate Emails

原文：http://www.cnblogs.com/immjc/p/7413656.html