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 |
+---------+
找到重复的Email。
MySQL
SELECT Email FROM Person GROUP BY Email HAVING COUNT(Email) > 1;
分析
无
