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Calculate cumulative sales for each product in each store, ordered by sale_date

General/Othermedium0.2 min readPremium
Frequency
Low
Asked at 1 company
Category
243
questions in General/Other
Difficulty Split
151E|43M|49H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Matrix
Interview Pro Tip

Pro-Move: 'We had duplicate sale_dates—used ROWS UNBOUNDED PRECEDING for deterministic order; RANGE was non-deterministic.' Red Flag: Using RANGE with duplicates—undefined order; use ROWS.

Key Concepts Tested
partitionsparksqlwindow
Expert AnswerPremium
43 wordsInterview-ready
**SQL**: SELECT product_id, store_id, sale_date, amount, SUM(amount) OVER (PARTITION BY product_id, store_id ORDER BY sale_date ROWS UNBOUNDED PRECEDING) AS cumulative_sales FROM sales. **Spark**: Window.partitionBy('product_id','store_id').orderBy('sale_date').rowsBetween(Window.unboundedPreceding, Window.currentRow). **Why**: Running total for YTD, progress....
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