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Updated weekly · Last refresh Oct 17

PotomacWave Data Analyst Interview Questions

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

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1
SQL & Data ManipulationStart here. 3 questions + 3 drills · ~54 min
Automating with Excel VBA or M-QueryMedium

Assesses automation skills and practical impact of reducing manual effort through scripting or queries.

Data ManipulationAutomationPotomacWave
Power BI Dashboards with DAXMedium

Assesses ability to build decision-ready BI dashboards using Power BI and DAX for broad audiences.

daxdata visualizationpower biPotomacWave
Complex Queries in MS AccessMedium

Evaluates SQL query design and problem-solving for complex data retrieval in MS Access.

sqlPotomacWave
SQL Joins, Procedures, and PipelinesHard
Practice
Practice drill

Build and validate a PostgreSQL stored procedure that joins case data and events into a reliable pipeline summary.

JoinsData ManipulationsqlSutherland
Top Ten Longest Active SessionsMedium
Practice
Practice drill

Identify the ten longest client sessions by pairing each login with its immediately following logout.

Date FunctionsData ManipulationData AnalysisVanguard
Truncate vs DeleteMedium
Practice
Practice drill

Explain how TRUNCATE and DELETE differ in row removal, transaction behavior, and identity handling.

database managementData Manipulationdata managementCCitiusTechSStandards AustraliaGGentrack
2
Behavioral & Leadership3 questions · ~24 min
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3
More topics5 questions · ~40 min
Advanced Statistics with RMedium

Evaluates statistical analysis capabilities and appropriate use of programming for advanced analytics.

ProgrammingPotomacWave
Data Cleaning Across Inconsistent SourcesMedium

Assesses data quality methods for reliable integration across heterogeneous and conflicting datasets.

data integrationdata cleaningdata validationPotomacWave
Accuracy and Compliance Under DeadlinesMedium

Assesses prioritization, quality control, and compliance discipline under schedule pressure.

time managementAccuracyCompliancePotomacWave
Turning Patterns into StrategyMedium

Assesses analytical thinking and ability to influence strategy based on data-driven insights.

Data AnalysisPotomacWave
Data Governance for Sensitive InfoMedium

Tests understanding of governance practices for protecting sensitive data in federal consulting environments.

data managementPotomacWave

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The finish line: interview-readyComplete all 11 questions plus 3 hands-on drills to finish this plan.