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

Since MySQL 8, cumulative sums are ideally calculated using window functions. In your case, run:

SELECT num, SUM(num) OVER (ORDER BY num) cumulative
FROM id