Cumulative sum over date ascending but order descending

[joboro]

Hi, I have the following source table:

date	quantity
2021-01-01	1
2021-01-02	1
2021-01-03	4
2021-01-04	9

I would like to have the following table:

date	quantity	accum_quantity
2021-01-04	9	15
2021-01-03	4	6
2021-01-02	1	2
2021-01-01	1	1

What set analysis should is use for "accum_quantity"? If the output table would be sorted by date ascending i could use the formula: 

Rangesum(ABOVE(Sum(QUANTITY),0,rowno()))

 The best case would be that the sum is independent from the sort order of the table...

KR

[joboro]

Thanks for the link, but i tried that already when i searched for a solution. Even when i use above in the set expression the column is still sortable.

[SunilChauhan]

i Have no idea .

One last this you Can try {1} in Sum or Range sum.