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ProcDNA Interview Questions

The questions to prepare for ProcDNA interviews, across all roles. Questions from real interview reports rank first. Updated daily.

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1
SQL & Data ManipulationStart here. 3 questions + 1 drill · ~41 min
Inner Join vs Outer JoinEasy
Practice
Recently asked

Demonstrate how INNER JOIN and FULL OUTER JOIN handle matching and unmatched rows.

JoinsData Wranglingnull valuesPProcDNA
Debug and Optimize Slow SQLMedium
Practice
Recently asked

Task A reporting query at a commerce platform summarizes recent orders for active customers, but the production version is slow. Write a PostgreSQL query t...

database optimizationlarge datasetsdatabase queryingPProcDNA
Handling Missing and Dirty SQL DataMedium
Recently asked

Explain how to profile, clean, and standardize missing or dirty data before analysis.

Data WranglingCase WhenQualityPProcDNA
SQL Query Performance TuningMedium
Practice
Practice drill

Explain how you would optimize a slow SQL query and verify the result set stays correct.

database optimizationlarge datasetsJoinsFilevine
2
Behavioral & Leadership6 questions · ~62 min
Strength and Growth AreaEasy
Recently asked

Tests self-awareness, ownership, and growth mindset through specific examples of a professional strength and an actively managed weakness.

self assessmentfeedbackstrengthsPProcDNA
Handle PressureEasy
Recently asked

Tests how candidates prioritize, communicate, and maintain accuracy when facing pressure.

behavior under pressurebehavioral interviewaccountabilityPProcDNA
Disagreement With a Team MemberEasy
Recently asked

Tests conflict resolution, listening, accountability, and the ability to reach a productive outcome with a teammate.

Conflict Resolutionbehavioral interviewteamworkPProcDNA
Handling a Challenging SituationMedium
Recently asked

Tests accountability, adaptability, judgment, and ownership when navigating a difficult workplace situation.

behavior under pressureaccountabilitybehavioralPProcDNA
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3
More topics1 question · ~10 min
The finish line: interview-readyComplete all 10 questions plus 1 hands-on drill to finish this plan.