题目7：MySQL----------DuplicateEmails
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 | +---------+题目解答：
# Write your MySQL query statement below SELECT DISTINCT a.Email FROM Person a JOIN Person b ON (a.Email = b.Email) WHERE a.Id <> b.Id
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