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Updated weekly · Last refresh Oct 17

Costar Business Analyst Interview Questions

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

33questions
~4htotal time
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1
ExecutionStart here. 6 questions · ~48 min
Ensure Analysis Data QualityMedium

Explain how you validate data quality before publishing an analysis that will drive an important business decision.

Data WranglingExecutionCostar
Resolve Conflicting Requirement PrioritiesMedium

Explain how you gather and align requirements when stakeholders want different outcomes and priorities.

Trade-offsRisk AssessmentScope ManagementCostar
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2
Behavioral & Leadership21 questions · ~168 min
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3
More topics6 questions · ~48 min
Tell Me About YourselfEasy

Craft a concise self-introduction that highlights fit, communication style, and relevance for an Account Executive role.

brand cultureBusiness AcumenCompetitive AnalysisCostar
Product Improvement With UIMedium

Assesses product sense and your ability to translate UI observations into actionable improvements.

product improvementCostar
Real Estate Valuation ApproachMedium

Evaluates your ability to apply valuation methods and translate results into business insights.

ValuationCostar
SQL Joins and Query WritingHard

Tests SQL proficiency by evaluating join understanding and practical query writing for BA tasks.

JoinssqlCostar
Handling Missing ValuesMedium

Tests data preprocessing choices and how they affect analysis validity.

RegressionHypothesis TestingData WranglingCostar
Python and SQL Data OperationsMedium

Tests your fundamentals in querying, transforming, and analyzing data for business insights.

JoinsData WranglingAggregationsCostar

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Optimizing Slow SQL QueriesMedium
Practice
Practice drill

Optimize a PostgreSQL reporting query using selective filtering, aggregation, indexing strategy, and execution-plan reasoning.

database optimizationJoinsindexesCapgeminiDDeltaXMelaleuca: The Wellness
Top Customers by Sales RevenueEasy
Practice
Practice drill

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

RankingGroup ByAggregationsHousecall ProEquifaxXYZ
SQL Average Selling PriceMedium
Practice
Practice drill

Calculate weighted average selling prices by product using a date-range join, aggregation, and NULL handling.

leetcodesqlCostarCostar Group
The finish line: interview-readyComplete all 33 questions plus 3 hands-on drills to finish this plan.