[프로그래머스] Lv.3 헤비 유저가 소유한 장소 [Oracle, 오라클]

• 문제 : https://school.programmers.co.kr/learn/courses/30/lessons/77487
• 서브쿼리 활용

SELECT id, name, host_id
from places a
where host_id in (select host_id
                  from places b
                  group by host_id
                  having count(name) >= 2)
order by id;