題目：
Write a SQL query to find all duplicate emails in a table named Person.
+----+---------+ | Id | Email | +----+---------+ | 1 | [email protected] | | 2 | [email protected] | | 3 | [email protected] | +----+---------+
For example, your query should return the following for the above table:
+---------+ | Email | +---------+ | [email protected] | +---------+
Note: All emails are in lowercase.
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解析：本題需要統計重複的郵箱名。首先用order by對Email列進行分組，之後選出count大於1的即可。代碼如下：
# Write your MySQL query statement below
SELECT Email FROM Person GROUP BY Email HAVING COUNT(*)>1;
