題目7：MySQL----------Duplicate Emails，email

題目7：MySQL----------Duplicate Emails，email

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

題目解答：

# Write your MySQL query statement belowSELECT DISTINCT a.EmailFROM Person a JOIN Person bON (a.Email = b.Email)WHERE a.Id <> b.Id