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Top 50 data warehouse Interview Questions

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

50questions
~8htotal time
73companies covered
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1
SQL & Data ManipulationStart here. 7 questions · ~68 min
Join Types and Lake vs WarehouseMedium
Practice
Recently asked

Explain LEFT JOIN behavior and compare data lakes with data warehouses using a concise SQL example.

null handlingJoinssqlCA Firm in KolkataPwC IndiaPwC
Data Warehouse vs Data LakeEasy
Practice
Recently asked

Aggregate platform metadata to compare warehouse and lake suitability for governed analytics and raw enterprise data.

data managementdata warehouseAggregationsIIBM IndiaIBM
Data Lake vs Data WarehouseMedium
Practice

Compare Walmart Global Tech data lake and warehouse assets using a full outer join and classification logic.

Joinsdata managementdata warehouseWalmart Global Tech
CDC to Warehouse Data ParityHard
Practice

Reconcile latest CDC customer records with warehouse data and report missing, extra, deleted, or mismatched records.

Data Qualitydata warehousedata validationIntuit
Optimize Slow SQL in Data WarehouseHard
Practice

Optimize a warehouse aggregation query by reducing scanned rows, aggregating early, and preserving deterministic output ordering.

Performance Tuningdatabase optimizationlarge datasetsApple
Schema Evolution in WarehousesMedium
Practice

Identify each warehouse table's latest deployed schema version and whether unresolved breaking changes require review.

database managementdata migrationschema evolutionCharles Schwab
SQL and Data Warehouse ConceptsMedium
Practice

Use PostgreSQL CTEs and joins to identify current, delayed, failed, and missing real-time warehouse pipeline loads.

JoinsCTEssqlIntercontinental Exchange

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2
Pipelines41 questions · ~397 min
Key Data Warehouse ConsiderationsHard
Recently asked

Explain the architectural, modeling, governance, performance, and operational considerations for designing a data warehouse.

Data QualityInfrastructureETLSun LifePhotonQuantumBlack
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3
More topics2 questions · ~19 min
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