SELECT
IM1.PORT_CODE AS 港コード
,PT.PORT_NAME AS 港名
,IM1.AMT AS 入国者数
,IM2.AMT AS 出国者数
,(IM1.AMT - IM2.AMT) AS 差分
FROM IMMIGRATION AS IM1
INNER JOIN IMMIGRATION AS IM2
ON IM1.PORT_CODE = IM2.PORT_CODE
AND IM2.KIND_CODE = '120'
INNER JOIN PORT AS PT
ON IM1.PORT_CODE = PT.PORT_CODE
WHERE IM1.GROUP_CODE = '120'
AND IM1.KIND_CODE = '110'
AND 差分 > 0
ORDER BY 差分 DESC,IM1.PORT_CODE DESC;