select 
d2.pf_code as "CODE"
,p.pf_name as "NAME"
,round(round(cast(d2.drink_amt as real))/round(cast(dall.all_amt as real)) *100 ,2)  as "PERCENTAGE"
from 
(select d.pf_code 
,sum(d.amt) as "drink_amt"
from drink_habits d
where 
d.category_code = 120
and d.gender_code in (2,3)
group by d.pf_code
) d2
,prefecture p
,(select d.pf_code 
,sum(d.amt) as "all_amt"
from drink_habits d
group by d.pf_code
) dall

where d2.pf_code = p.pf_code
and d2.pf_code = dall.pf_code
order by "PERCENTAGE" desc,p.pf_code desc