# ---
# title: 182. Duplicate Emails
# id: problem182
# author: Tian Jun
# date: 2020-10-31
# difficulty: Easy
# categories: 
# link: <https://leetcode.com/problems/duplicate-emails/description/>
# hidden: true
# ---
# 
# 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 |
#     +---------+
#     
# 
# **Note** : All emails are in lowercase.
# 
# 
## @lc code=start
using LeetCode

## add your code here:
## @lc code=end
