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
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?