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https://leetcode.com/problems/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 | +---------+
select Email from Person group by Email having count(*) > 1
[LeetCode][SQL]Duplicate Emails
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原文地址:http://www.cnblogs.com/Liok3187/p/4508053.html