LeetCode Duplicate Emails
Problem
Write a SQL query to find all duplicate emails in a table named Person.
1
2
3
4
5
6
7
+----+---------+
| 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:
1
2
3
4
5
+---------+
| Email |
+---------+
| a@b.com |
+---------+
找到重复的Email。
MySQL
1
2
3
SELECT Email FROM Person GROUP BY Email HAVING COUNT(Email) > 1;
分析
无
本文由作者按照 CC BY 4.0 进行授权