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Costar Group Business Analyst Interview Questions

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

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~4htotal time
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1
SQL & Data ManipulationStart here. 3 questions + 3 drills · ~54 min
Join Types in Transaction DataEasy

Explain INNER JOIN vs LEFT JOIN and describe a many-to-one relationship using card transaction data.

JoinsData Wranglingmany-to-oneCostar Group
SQL Join With Timestamp DedupMedium

Tests SQL skills for joins, filtering, and deduplication logic using timestamps.

JoinsCostar Group
Write SQL for Typical NeedsMedium

Tests your ability to translate business questions into correct SQL for day-to-day analytics work.

Costar Group
Calculate Monthly Sales Growth by Product CategoryMedium
Practice
Practice drill

Calculate month-over-month sales growth for each product category using JOINs and window functions.

JoinsAggregationsWayfairREVOLVEFanatics
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
2
Behavioral & Leadership22 questions · ~176 min
Resume Project With Business ImpactEasy

Tests ownership and data-driven communication through a concrete example of analysis that led to measurable business impact.

impactresumesuccess storyCostar Group
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3
More topics4 questions · ~32 min
Tell Me About YourselfEasy

Tests your ability to deliver a clear, relevant introduction tailored to the role at Aqr.

Competitive AnalysisGo-to-MarketCostar Group
Track Performance With KPIsMedium

Tests your ability to set measurable goals and report progress in a data-driven environment at CoStar Group.

performance trackingMetricsKPICostar Group
Real Estate Valuation ApproachMedium

Evaluates your understanding of real estate valuation methods and how you applied them.

ValuationCostar Group
Product Improvement With UIMedium

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

product improvementCostar Group

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