Creating a cumulative sum column in MySQL
num
1
5
6
8
2
3

num cumulative
1    1
2    3
3    6
5    11
6    17
8    25

select a.num, sum(b.num) from ID a, ID b where b.num <= a.num group by a.num order by a.num;

Select num as n,
       (select sum(num) from ID where num <= n)
from ID order by n;

SELECT  a.num,
   (@s := @s + a.num) AS cumulative
FROM ID a, (SELECT @s := 0) dm
ORDER BY a.num;

declare @tmp table(ind int identity(1,1),col1 int)
insert into @tmp
select 2
union
select 4
union
select 7
union

select 5
union
select 8
union
select 10


 SELECT t1.col1,sum( t2.col1)
    FROM @tmp AS t1 LEFT JOIN @tmp t2 ON t1.ind>=t2.ind
    group by t1.ind,t1.col1

select t1.col1,(select sum(col1) from  @tmp as t2 where t2.ind<=t1.ind)
from @tmp as t1