SELECT
    AGE_CODE AS "年齢コード"
    ,AGE_NAME AS "年齢階層名"
    ,SUM(SP_TIME_5) AS "5時間未満"
    ,SUM(SP_TIME_6) AS "5時間以上6時間未満"
    ,SUM(SP_TIME_7) AS "6時間以上7時間未満"
    ,SUM(SP_TIME_8) AS "7時間以上8時間未満"
    ,SUM(SP_TIME_9) AS "8時間以上9時間未満"
    ,SUM(SP_TIME_9OVER) AS "9時間以上"
FROM SLEEP_TIME_DTL
        NATURAL JOIN
    PREFECTURE
        NATURAL JOIN
    AGE_GRP
GROUP BY
    AGE_CODE, AGE_NAME
ORDER BY
    AGE_CODE, AGE_NAME;