Creating a cumulative sum column in MySQL

Question

Sample table ID: (num is a key so there wouldn\'t be any duplicates)

num
1
5
6
8
2
3

Desired output:
(Should be sorted and have a cumul

Answer 1

as these answer i already tested in my project and actually i want to know which one is faster so i also posted this here which one is faster

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