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Compute the moving average of daily transactions over a 7-day window.

General/Othermedium0.3 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
Goldman Sachs
Key Concepts Tested
sparksqlwindow
Expert AnswerPremium
51 wordsInterview-ready
**SQL**: SELECT trans_date, SUM(amount) AS daily, AVG(SUM(amount)) OVER (ORDER BY trans_date ROWS BETWEEN 6 PRECEDING AND CURRENT ROW) AS ma_7d FROM transactions GROUP BY trans_date. **Logic**: Inner SUM for daily total; outer AVG over 7 rows. **Spark**: Group by date, then window....
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