LeetCode 0182 - Duplicate Emails

Reck Zhang

发布于 2021-08-11 14:52:39

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Duplicate Emails

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.

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

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