SELECT PORT.PORT_CODE AS '港コード', 
        PORT.PORT_NAME AS '港名',
        SUM(CASE WHEN IMMIGRATION.KIND_CODE = 110 THEN IMMIGRATION.AMT ELSE NULL END) AS '入国者数',
        SUM(CASE WHEN IMMIGRATION.KIND_CODE = 120 THEN IMMIGRATION.AMT ELSE NULL END) AS '出国者数',
        SUM(CASE WHEN IMMIGRATION.KIND_CODE = 110 THEN IMMIGRATION.AMT ELSE NULL END) - SUM(CASE WHEN IMMIGRATION.KIND_CODE = 120 THEN IMMIGRATION.AMT ELSE NULL END) AS '差分'
        FROM PORT 
        INNER JOIN IMMIGRATION ON PORT.PORT_CODE = IMMIGRATION.PORT_CODE
        INNER JOIN GRP ON IMMIGRATION.GROUP_CODE = GRP.GROUP_CODE
        GROUP BY PORT.PORT_CODE
        HAVING SUM(CASE WHEN IMMIGRATION.KIND_CODE = 110 THEN IMMIGRATION.AMT ELSE NULL END) > SUM(CASE WHEN IMMIGRATION.KIND_CODE = 120 THEN IMMIGRATION.AMT ELSE NULL END)
        ORDER BY SUM(CASE WHEN IMMIGRATION.KIND_CODE = 120 THEN IMMIGRATION.AMT ELSE NULL END) - SUM(CASE WHEN IMMIGRATION.KIND_CODE = 110 THEN IMMIGRATION.AMT ELSE NULL END) ASC,
                    PORT.PORT_CODE DESC