Top 50 ETL Interview Questions
The most frequently asked ETL questions across all roles and companies, ranked by real interview frequency. Updated daily.
Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.
Total Wine & More
Inc.
Benjamin MooreCompute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.
ADPClean raw status text with TRIM and LOWER, filter unusable rows, and count usable events by cleaned status.
DatabricksUse joins, CTEs, and CASE logic to flag and fill missing financial fields for Qlik planning records.
QlikUse joins, date filtering, and aggregation to produce a faster month-end report from cleaned transaction data.
ASI (Advertising Specialty Institute)Sign up to see every question
Create a free account to unlock this list and practice real interview questions.
Compare batch and stream processing across latency, complexity, cost, and data quality in a modern analytics pipeline.
MicroStrategy
Zendesk
Alabama StaffingApproach for safely backfilling missing data while preserving correctness, idempotency, and data quality.
Bread Financial
InfobloxAlabama StaffingProblem Given a list of data values, including some missing or null values represented by None, implement a function that returns a cleaned list. The clean...