Leetcode - 196. Delete Duplicate Emails

문제

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LeetCode

정답

서브쿼리를 사용하는 방법

DELETE FROM Person
WHERE id NOT IN 
(
    SELECT MIN(id)
    FROM (SELECT * FROM Person) AS temp
    GROUP BY email
);

하나의 테이블을 ALIAS로 두 번 가져오는 방법

DELETE p1 FROM Person p1, Person p2
WHERE
    p1.Email = p2.Email AND p1.Id > p2.Id