테이블 생성하기 Create table If Not Exists Person (id int, email varchar(255)) Truncate table Person insert into Person (id, email) values ('1', 'a@b.com') insert into Person (id, email) values ('2', 'c@d.com') insert into Person (id, email) values ('3', 'a@b.com') 문제 결과코드 # Write your MySQL query statement below SELECT email AS Email FROM Person GROUP BY Email HAVING COUNT(Email)>=2; 해설 GROUP BY로 emai..
