select
    id,
    a.price as price_1701,
    b.price as price_1702,
    c.price as price_1703
from
    t_1701 as a
    full join t_1702 as b using (id)
    full join t_1703 as c using (id)
order by
    id ;

select
    id,
    a.price as price_1701,
    b.price as price_1702,
    c.price as price_1703
from
    ( select id from t_1701
      union
      select id from t_1702
      union
      select id from t_1703
    ) as t
    left join t_1701 as a using (id)
    left join t_1702 as b using (id)
    left join t_1703 as c using (id)
order by
    id ;