Top 50 data handling Interview Questions
The most frequently asked data handling questions across all roles and companies, ranked by real interview frequency. Updated daily.
Optimize a slow PostgreSQL query on a large dataset by choosing better filters, joins, and indexes.
CitiOOptimoveTThoucentricCalculate weekday-only 7-day rolling revenue averages per product while excluding weekends and ignoring missing dates.
Microsoft
Amazon Web ServicesIdentify missing and invalid longitudinal measurements using scheduled visits and measurement validation rules.
Parse live-tail queries and logs, then return incrementing query IDs whose words all occur in each log line.
DatadogSummarize each user's latest modal, accordion, and dropdown state from UI events.
DeloitteClassify missing and statistically unusual financial transactions using PostgreSQL aggregates, joins, and CASE logic.
BlackRock
United Auto CreditFill bounded gaps in sensor time series and identify values that cannot be reliably inferred.
Rent The RunwayLLegal & GeneralSummarize processed records by category and return the three categories with the highest record counts.
Plaid
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