[LeetCode] 182. Duplicate Emails_Easy tag: SQL
2018-08-18 11:19 Johnson_强生仔仔 阅读(123) 评论(0) 编辑 收藏 举报Write a SQL query to find all duplicate emails in a table named Person
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+----+---------+ | 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