LeetCode 0182 - Duplicate Emails

Duplicate Emails

Desicription

Write a SQL query to find all duplicate emails in a table named Person.

代码语言：javascript复制

 ---- --------- 
| 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:

代码语言：javascript复制

 --------- 
| Email   |
 --------- 
| a@b.com |
 --------- 

Note: All emails are in lowercase.

Solution

代码语言：javascript复制

SELECT DISTINCT P1.Email
AS Email
from Person P1, Person P2
WHERE P1.Email = P2.Email AND P1.Id != P2.Id

sql lowercase return table

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