select distinct
    f.PF_CODE as 都道府県コード
  , p.PF_NAME as 都道府県名
  , NTH_VALUE(n.NATION_NAME, 1) OVER(PARTITION BY f.PF_CODE ORDER BY AMT DESC) as "1位 国名"
  , NTH_VALUE(f.AMT        , 1) OVER(PARTITION BY f.PF_CODE ORDER BY AMT DESC) as "1位 人数"
  , NTH_VALUE(n.NATION_NAME, 2) OVER(PARTITION BY f.PF_CODE ORDER BY AMT DESC) as "2位 国名"
  , NTH_VALUE(f.AMT        , 2) OVER(PARTITION BY f.PF_CODE ORDER BY AMT DESC) as "2位 人数"
  , NTH_VALUE(n.NATION_NAME, 3) OVER(PARTITION BY f.PF_CODE ORDER BY AMT DESC) as "3位 国名"
  , NTH_VALUE(f.AMT        , 3) OVER(PARTITION BY f.PF_CODE ORDER BY AMT DESC) as "3位 人数"
  , SUM(AMT)                    OVER(PARTITION BY f.PF_CODE)                   as 合計人数
from
           FOREIGNER f
inner join PREFECTURE p
        on f.PF_CODE  = p.PF_CODE
inner join NATIONALITY n
        on f.NATION_CODE = n.NATION_CODE
where
    f.NATION_CODE <> '113'
order by
    合計人数 DESC
  , 都道府県コード ASC
;