It’s dificil ton explain, i want to Sum the 3 last row for every row. An exemple will be better :

ID  VALUE1  RESULT I WANT
===================
1   10   10+5+20 = 35
2   5    5+20+4  = 29
3   20   20+4+50 = 74
4   4    4+50+300 = 354
5   50   50+300+10 = 360
6   300  300+10+15 = 325
7   10   NULL
8   15   NULL

I use Oracle SQL. Thanks

with dummy as 
(
   select 10 as value from dual union all
   select 5 from dual union all
   select 20 from dual union all
   select 4 from dual union all
   select 50 from dual union all
   select 300 from dual union all
   select 10 from dual union ALL
   select 15 from dual 
)
SELECT value, SUM(value) FROM dummy GROUP BY value

i dont have idea to how to process