select age.age_name as 年齢階層,
sum(case when dtl.time_code = 120 then 1 else 0 end) as '5時間未満',
sum(case when dtl.time_code = 130 then 1 else 0 end) as '5時間以上6時間未満	',
sum(case when dtl.time_code = 140 then 1 else 0 end) as '6時間以上7時間未満',
sum(case when dtl.time_code = 150 then 1 else 0 end) as '7時間以上8時間未満	',
sum(case when dtl.time_code = 160 then 1 else 0 end) as '8時間以上9時間未満',
sum(case when dtl.time_code = 170 then 1 else 0 end) as '9時間以上',
sum(case when dtl.time_code = 180 then 1 else 0 end) as '不詳'
from age_grp as age
join sleep_time as time
join sleep_time_dtl as dtl
    on dtl.time_code = time.time_code and dtl.age_code = age.age_code
group by age.age_code