題目描述:
編寫一個 SQL 查詢,查找 Person
表中所有重複的電子郵箱。
示例:
+----+---------+
| Id | Email |
+----+---------+
| 1 | [email protected] |
| 2 | [email protected] |
| 3 | [email protected] |
+----+---------+
根據以上輸入,你的查詢應返回以下結果:
+---------+
| Email |
+---------+
| [email protected] |
+---------+
說明:所有電子郵箱都是小寫字母。
代碼實現:
# Write your MySQL query statement below
select Email from Person group by Email having count(Email) > 1