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Updated weekly · Last refresh Aug 30

Costar Group Data Analyst Interview Questions

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

13questions
~2htotal time
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1
SQL & Data ManipulationStart here. 7 questions + 2 drills · ~82 min
Calculate Monthly Sales Growth by Product CategoryMedium
Practice

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

JoinsAggregationsCostar Group
Cleaning Nulls and Duplicate RecordsEasy

Explain how to clean nulls, remove duplicates, and standardize inconsistent values during SQL transformations.

Data WranglingCase WhenAggregationsCostar Group
SQL Query OptimizationMedium

Tests your approach to diagnosing and improving SQL performance.

Performance Tuningquery optimizationtechnical experienceCostar Group
Fixing Slow QueriesHard

Tests your troubleshooting skills and practical performance tuning strategies.

query optimizationTroubleshootingCostar Group
SQL Joins and FilteringMedium

Tests your ability to write correct SQL joins and apply precise filtering logic.

Joinssql queryCostar Group
Choosing the Right JoinMedium

Tests your understanding of join semantics and correct selection for analysis needs.

data relationshipstechnical knowledgeCostar Group
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
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2
Behavioral & Leadership6 questions · ~54 min
Prioritizing Competing Data RequestsMedium

Tests prioritization under pressure in a data engineering context, including stakeholder management, trade-off decisions, and ownership of outcomes.

Decision MakingStakeholder ManagementPrioritizationCostar Group
Explaining Technical Issues ClearlyMedium

Tests whether you can translate technical complexity into business-relevant language for non-technical stakeholders and drive action.

Stakeholder ManagementCommunicationtechnical explanationCostar Group
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The finish line: interview-readyComplete all 13 questions plus 2 hands-on drills to finish this plan.