Onfly Query - cumulative sum the stock change values by articles

[Durumdara <durumdara@xxxxxxxxx>]

Hello!

I have a query where I can show the positive and negative future changes of the articles.

For example:

select art.id, art.name, art.actual_stock, art.min_stock, change.stock_change, change.date

from change left join art on art.id = change.art_id

order by art.id, change.id

Ok, I have a list of the changes.

I need to sum these changes to get the rows where the stock is negative or below the minimum.

1, bla, 100, 20, +20,  2021-02-01, [120]

1, bla, 100, 20, -10,  2021-02-01, [110]

1, bla, 100, 20, -100,  2021-02-01, [10] - below minimum    

1, bla, 100, 20, -20,  2021-02-01, [-10] - below zero

2, bli, 20, 10, 10,   2021-02-01, [20]

2, bli, 20, 10, -15,   2021-02-01, [5]   below minimum

How do I use a window function (can I use it) to "reset" the stock in every first record of the articles - to cumulate the data?

Or do I need to store data in a temporary table and use stored procedure to fill up the cumulated stock value?

Thank you for the answer!

Best regards

ddd