Windfall Data Data Analyst Interview Questions

The questions to prepare for a Windfall Data Data Analyst interview. Questions from real interview reports rank first. Updated daily.

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SQL & Data ManipulationStart here. 6 questions + 1 drill · ~66 min

Handling Duplicates and Nulls in SQLEasy

Explain practical SQL approaches for identifying, removing, and preventing duplicates and NULL-related data quality issues.

Data WranglingGroup ByCase When

Windfall Data

SQL-Centered Data WorkMedium

Assesses practical SQL skills and how you approach data manipulation tasks.

data processingsql

Windfall Data

Second-Highest Donation QueryMedium

Practice

Find the second-highest distinct donation amount while excluding duplicate and NULL values.

null handlingRankingsql

Windfall Data

Running Total With Window FunctionsEasy

Practice

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

Window FunctionsDate FunctionsRunning Totals

Windfall Data

Optimize Large Join QueryHard

Tests performance tuning skills for large joins and high-velocity data workloads at Windfall Data.

Performance TuningJoinssql

Windfall Data

Join Types and When to UseMedium

Tests understanding of SQL join semantics and choosing the right join for correct matching/enrichment results.

Joinssql

Windfall Data

SQL Duplicate Consumer ProfilesMedium

Practice

Practice drill

Identify likely duplicate consumer profiles using normalized partial names and matching locations.

data cleaningnull handlingJoins

Windfall Data

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Behavioral & Leadership11 questions · ~104 min

Owning a High-Stakes Data ErrorEasy

Tests ownership and attention to detail in a technical data issue, plus stakeholder communication under pressure.

behavioral questionstechnical experienceself introduction

Windfall Data

Delivering Analysis Without Full InputsMedium

Tests prioritization under pressure when dependencies block progress, including stakeholder management, influence without authority, and ownership of the outcome.

time managementcross-functional collaborationdeadline management

Windfall Data

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