Leetcode 182 Find duplicate email (2022.07.01)

Create table If Not Exists Person (id int, email varchar(255))
Truncate table Person
insert into Person (id, email) values ('1', '[email protected]')
insert into Person (id, email) values ('2', '[email protected]')
insert into Person (id, email) values ('3', '[email protected]')

Write a SQL Inquire about , lookup Person All duplicate email addresses in the table .

Example ：

±—±--------+
| Id | Email |
±—±--------+
| 1 | [email protected] |
| 2 | [email protected] |
| 3 | [email protected] |
±—±--------+

According to the above input , Your query should return the following results ：

±--------+
| Email |
±--------+
| [email protected] |
±--------+
explain ： All e-mails are in lowercase letters .

source ： Power button （LeetCode）
link ：https://leetcode.cn/problems/duplicate-emails

Method 1 ： Use GROUP BY and HAVING Words and expressions

MySQL Submission ：

# Write your MySQL query statement below
select Email
from Person
group by Email
having count(Email) > 1;