select count(*) from room
where not exists(
    select building_id, floor_num, room_num from room r
    join reservation re
    on(
        r.room_num = re.room_num and
        r.floor_num = re.floor_num and
        r.building_id = re.building_id
    )s
    group by room_num, floor_num
    where arrival_date<=?1 and departure_date>=?1 and capacity =?2 and price =?3
)