https://leetcode.com/problems/duplicate-emails/
Duplicate Emails - LeetCode
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leetcode.com
email이 중복된 id를 출력하면 되는 문제
SELECT
email AS Email
FROM Person
GROUP BY email
HAVING COUNT(email) > 1
;GROUP BY + HAVING을 활용하여 간단하게 풀이할 수 있다.
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