From: | Durumdara <durumdara(at)gmail(dot)com> |
---|---|
To: | Postgres General <pgsql-general(at)postgresql(dot)org> |
Subject: | Onfly Query - cumulative sum the stock change values by articles |
Date: | 2021-01-07 09:17:42 |
Message-ID: | CAEcMXhm8oakWjW_KOZAbhvp=Hryx=PmJcz6JxQ242afund7maQ@mail.gmail.com |
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Lists: | pgsql-general |
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
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