Porter Data Analyst Interview Questions
The questions to prepare for a Porter Data Analyst interview. Questions from real interview reports rank first. Updated daily.
Explain how RANK() and DENSE_RANK() handle ties differently in ordered SQL results such as leaderboards.
Explain how UNION and UNION ALL differ when combining result sets, especially around duplicate handling and performance.
Explain practical SQL approaches for identifying, removing, and preventing duplicates and NULL-related data quality issues.
Calculate average completed delivery time per active Porter driver using a LEFT JOIN and grouped timestamp aggregation.
Demonstrate LEAD, LAG, and RANK to compare employee usage across months and rank usage within each month.
ComcastCalculate a three-day moving average of active-client revenue using aggregation and SQL window functions.
Assesses your ability to plan experiment duration and sample size for a target DAU lift.
Evaluates your understanding of A/B testing validity, sampling bias, and experimental integrity.
Evaluates your experimental design thinking for pricing changes and causal impact measurement.
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Evaluates your ability to hypothesize and investigate drivers of sudden revenue drops.
Tests your ability to define measurable outcomes and KPIs for a Porter driver incentive program.