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create table temp_nation as
select 'Seoul' city, 'Korea' country from dual union all
select 'Busan' city, 'Korea' country from dual union all
select 'Inchon' city, 'Korea' country from dual union all
select 'LA' city, 'America' country from dual union all
select 'Newyork' city, 'America' country from dual union all
select 'Mexicocity' city, 'Mexico' country from dual
;

select country, substr(max(sys_connect_by_path(city,',')),2) result
from
(
    select city, country, row_number() over (partition by country order by city) rnum
    from   temp_nation
)
start with rnum=1
connect by prior rnum=rnum-1
and prior country=country    --> group별로 지정할 경우
group by country
;
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