LeeCode(Database)-Duplicate Emails

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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 |
+---------+

1 # Write your MySQL query statement below
2 select Email from Person group by Email having COUNT(Email)>1

LeeCode(Database)-Duplicate Emails

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原文地址：http://www.cnblogs.com/vpoet/p/4679614.html