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 | +---------+
Note: All emails are in lowercase.
Code
SELECT Email from Person GROUP BY Email HAVING count(Email) > 1
[LeetCode] 182. Duplicate Emails_Easy tag: SQL
原文：https://www.cnblogs.com/Johnsonxiong/p/9496602.html