[프그] 헤비 유저가 소유한 장소

https://school.programmers.co.kr/learn/courses/30/lessons/77487

select p.id, p.name, p.host_id
from places p
inner join (select host_id
            from places
            group by host_id
            having count(distinct id) > 1) t
on p.host_id = t.host_id
order by p.id