with t as 
(select '2020-06-01' dt, 3 a, 4 b, 5 c, 7 d from dual union all
 select '2020-05-12', 4, 8, 9, 2 from dual union all
 select '2020-06-08', 1, 3, 5, 1 from dual
)
select nvl(dt, '합계')
     , sum(a) as a
     , max(b) keep(dense_rank last order by dt) as b
     , sum(c) as c
     , max(d) keep(dense_rank last order by dt) as d
from t
group by rollup(dt)
order by dt
;