MySQL query that computes partial sums

Question

What query should I execute in MySQL database to get a result containing partial sums of source table?

For example when I have table:

Id|Val
1 | 1
2         


        

Answer 1

SELECT l.Id, SUM(r.Val) AS Val
FROM your_table AS l
    INNER JOIN your_table AS r
        ON l.Val >= r.Val
GROUP BY l.Id
ORDER By l.Id