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Duplicate Emails

Duplicate Emails

作者: myang199088 | 来源:发表于2015-04-16 08:50 被阅读17次
    • Problem
      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

    Write your MySQL query statement below

    select Email from Person group by Email having count(*) > 1

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