题目:
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.
Subscribe to see which companies asked this question
解析:本题需要统计重复的邮箱名。首先用order by对Email列进行分组,之后选出count大于1的即可。代码如下:
# Write your MySQL query statement below
SELECT Email FROM Person GROUP BY Email HAVING COUNT(*)>1;