with nyu as (
select
    i.PORT_CODE,
    i.KIND_CODE,
    i.GROUP_CODE,
    p.PORT_NAME,
    ifnull(i.AMT, 0) as AMT
from
    IMMIGRATION as i
    join PORT as p
    on i.PORT_CODE = p.PORT_CODE
where
    i.KIND_CODE = 110 AND
    p.PORT_NAME IS NOT NULL
)
, syu as (
select
    i.PORT_CODE,
    i.KIND_CODE,
    i.GROUP_CODE,
    p.PORT_NAME,
    ifnull(i.AMT, 0) as AMT
from
    IMMIGRATION as i
    join PORT as p
    on i.PORT_CODE = p.PORT_CODE
where
    i.KIND_CODE = 120 AND
    p.PORT_NAME IS NOT NULL
)
select
    nyu.PORT_CODE as 港コード,
    nyu.PORT_NAME as 港名,
    nyu.AMT as 入国者数,
    syu.AMT as 出国者数,
    nyu.AMT - syu.AMT as "差分"
from
    nyu
    join syu
    on nyu.PORT_CODE = syu.PORT_CODE
where
    nyu.AMT >= syu.AMT
order by
    差分 desc,
    港コード desc