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Calculate a 7-day moving average of clicks for each user_id

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: 'For sparse data we use RANGE INTERVAL—handles missing days; ROWS fails when dates skip.' Red Flag: ROWS 7 PRECEDING—that is 8 rows; 7-day = 6 PRECEDING.

Key Concepts Tested
partitionsparksqlwindow
Expert AnswerPremium
49 wordsInterview-ready
**SQL**: SELECT user_id, date, clicks, AVG(clicks) OVER (PARTITION BY user_id ORDER BY date ROWS BETWEEN 6 PRECEDING AND CURRENT ROW) AS ma_7d FROM clicks. **Spark**: Window.partitionBy('user_id').orderBy('date').rowsBetween(-6, 0). **Why ROWS**: ROWS 6 PRECEDING = 7 rows (current + 6). Use RANGE for gaps....
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