Porter Data Analyst Interview Questions
The questions to prepare for a Porter Data Analyst interview. Questions from real interview reports rank first. Updated weekly.
Explain how RANK() and DENSE_RANK() handle ties differently in ordered SQL results such as leaderboards.
Explain practical SQL approaches for identifying, removing, and preventing duplicates and NULL-related data quality issues.
Explain how UNION and UNION ALL differ when combining result sets, especially around duplicate handling and performance.
Calculate average completed delivery time per active Porter driver using a LEFT JOIN and grouped timestamp aggregation.
Calculate a three-day moving average of active-client revenue using aggregation and SQL window functions.
AArete
MITRE
GlassdoorCalculate a calendar-aware 7-day average of Samsara incident counts using CTEs and window functions.
SamsaraAssesses your ability to plan experiment duration and sample size for a target DAU lift.
Evaluates your ability to reason about experiment duration and statistical power.
Evaluates your experimental design thinking for pricing changes and causal impact measurement.
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Tests your ability to define measurable outcomes and KPIs for a Porter driver incentive program.
Evaluates your ability to hypothesize and investigate drivers of sudden revenue drops.