select
    PF_CODE as '都道府県コード',
    PF_NAME as '都道府県名',
    MAX(CASE WHEN ra = 1 THEN NATION_NAME ELSE NULL END) as '1位 国名',
    MAX(CASE WHEN ra = 1 THEN NATION_NAME ELSE 0 END) as '1位 人数',
    MAX(CASE WHEN ra = 2 THEN NATION_NAME ELSE NULL END) as '2位 国名',
    MAX(CASE WHEN ra = 2 THEN NATION_NAME ELSE 0 END) as '2位 人数',
    MAX(CASE WHEN ra = 3 THEN NATION_NAME ELSE NULL END) as '3位 国名',
    MAX(CASE WHEN ra = 3 THEN NATION_NAME ELSE 0 END) as '3位 人数',
    SUM(AMT) as '合計人数'
from
(select
    p.PF_CODE,
    p.PF_NAME,
    n.NATION_NAME,
    ROW_NUMBER() OVER (partition by f.PF_CODE order by AMT DESC, f.NATION_CODE) AS ra,
    f.AMT
from
    FOREIGNER f
inner join
    NATIONALITY n
on f.NATION_CODE = n.NATION_CODE
inner join
    PREFECTURE p
on f.PF_CODE = p.PF_CODE
where f.NATION_CODE != '113'
) t
group by 
    PF_CODE
order by
    SUM(AMT) desc,
    PF_CODE
;