select
age.AGE_CODE as 年齢コード,
age.AGE_NAME as 年齢階層名,
sum(dtl.SP_TIME_5) as "5時間未満",
sum(dtl.SP_TIME_6) as "5時間以上6時間未満",
sum(dtl.SP_TIME_7) as "6時間以上7時間未満",
sum(dtl.SP_TIME_8) as "7時間以上8時間未満",
sum(dtl.SP_TIME_9) as "8時間以上9時間未満",
sum(dtl.SP_TIME_9OVER) as "9時間以上"

from 
SLEEP_TIME_DTL as dtl
inner join AGE_GRP as age
on dtl.AGE_CODE = age.AGE_CODE
inner join PREFECTURE as pf
on dtl.PF_CODE = pf.PF_CODE

where
-- [対象の要素名] IN([値1,値2,値3…]);
pf.PF_NAME in ("北海道", "青森県", "岩手県", "宮城県", "福島県")

group by 
age.AGE_CODE

order by 
age.AGE_CODE;