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Top 50 Window Functions Interview Questions

The most frequently asked Window Functions questions across all roles and companies, ranked by real interview frequency. Updated daily.

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Window FunctionsStart here. 50 questions · ~1000 min
7-Day Rolling Active UsersMedium
Practice
Recently asked

Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.

Window FunctionsDate FunctionsRunning TotalsMetaSpotifyMeta IT
Handling Missing DataMedium
Practice
Recently asked

Standardize missing observation fields with fallback values, missingness flags, and ordered output.

Window Functionsmissing valuesdata cleaningEversource EnergyCincinnati Children's HospitalAdtalem Global Education
SQL Window Functions Moving AverageMedium
Practice
Recently asked

Calculate a three-day moving average of active-client revenue using aggregation and SQL window functions.

Window FunctionsData AnalysissqlEEvalueserveSShyena Tech YarnsAATB Financial
Use Window FunctionsMedium
Practice
Recently asked

Demonstrate window functions by ranking active employees by salary within each department.

Window FunctionsData ManipulationRankingJohnson & JohnsonAvidXchangeCRIF
Calculate 30-Day User RetentionHard
Practice
Recently asked

Use CTEs, joins, and date filtering to calculate 30-day retention by signup cohort from login and feature usage data.

Window FunctionsDate FunctionsAggregationsCurefitIndeedTikTok
Top Customers by Region VolumeMedium
Practice
Recently asked

Find the top 3 customers in each region by transaction volume using joins, aggregation, and window ranking.

Window FunctionsJoinsRankingJPMorganChaseSilicon Valley BankBanco Santander
Running Total With Window FunctionsEasy
Practice
Recently asked

Calculate each user's running order total over time using a window function.

Window FunctionsDate FunctionsRunning TotalsBayerSparksoftWestern Digital
SQL Window Functions Rolling AverageMedium
Practice
Recently asked

Calculate three-day rolling average sales by region using aggregation, joins, and PostgreSQL window functions.

Window FunctionssqlAAreteSSweetwaterRRichemont
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