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2020 Companies Data Analyst Interview Questions

The questions to prepare for a 2020 Companies Data Analyst interview. Questions from real interview reports rank first. Updated weekly.

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1
MetricsStart here. 4 questions · ~32 min
Critical Metrics for Product LaunchMedium

Choose the most important launch metrics, balancing early signals, long-term outcomes, and a clear KPI hierarchy.

KPIsConversion RateLeading Indicators2020 Companies
Build a Marketing KPI DashboardMedium

Design a dashboard that connects campaign activity, funnel conversion, and acquisition efficiency to business outcomes.

North Star MetricKPIsLeading Indicators2020 Companies
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2
Behavioral & Leadership10 questions · ~80 min
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3
More topics6 questions · ~48 min
Data Cleaning in ETL PipelinesEasy

Approach for cleaning and preparing raw data inside an ETL pipeline.

Data WranglingETLQuality2020 Companies
Marketing Campaign A/B Test DesignMedium

Design a marketing campaign experiment with a pre-registered metric plan, power calculation, and ship rule that respects guardrails.

ExperimentationHypothesis TestingA/B Testing2020 Companies
SQL For Sales Across TablesMedium

Tests your SQL skills for joins, aggregations, and analysis across relational datasets.

JoinsGroup ByAggregations2020 Companies
Statistical Methods ComfortEasy

Tests your statistical toolkit and ability to choose appropriate methods for analysis.

Confidence IntervalsRegressionHypothesis Testing2020 Companies
Handle Incomplete Pipeline DataMedium

Approach for handling missing, inconsistent, and duplicate data in a pipeline without breaking downstream analytics.

Data WranglingETLQuality2020 Companies
Top Products With Window FunctionsMedium

Tests your ability to use window functions for ranking and top-N analysis in SQL.

Window FunctionsRankingAggregations2020 Companies

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Top Daily Rides by VehicleMedium
Practice
Practice drill

Rank the top 3 completed rides per vehicle per day using joins, a CTE, and ROW_NUMBER.

Window FunctionsJoinsData WranglingWaymo
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
The finish line: interview-readyComplete all 20 questions plus 3 hands-on drills to finish this plan.