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Updated weekly · Last refresh Oct 17

Quantiphi Data Analyst Interview Questions

The questions to prepare for a Quantiphi Data Analyst interview. Questions from real interview reports rank first. Updated daily.

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1
SQL & Data ManipulationStart here. 11 questions · ~114 min
Top Customers by Last-Quarter SpendMedium
Practice

Join customers and transactions, filter to the previous quarter, aggregate spend, and return the top three customers by total spend.

Date FunctionsJoinsAggregationsQuantiphi
Top Customers by Sales RevenueEasy
Practice

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

RankingGroup ByAggregationsQuantiphi
RANK vs DENSE_RANK in LeaderboardsEasy

Explain how RANK() and DENSE_RANK() handle ties differently in ordered SQL results such as leaderboards.

Window FunctionsRankingData WranglingQuantiphi
Optimizing Slow Queries at ScaleHard

Explain how to diagnose and optimize a slow PostgreSQL query on large Apidel Technologies datasets.

SubqueriesJoinsData WranglingQuantiphi
Customer Orders: LEFT vs INNER JOINEasy

Explain how INNER JOIN and LEFT JOIN differ, and when to use each for matched-only versus all-left-row analysis.

JoinsData WranglingGroup ByQuantiphi
Truncate vs DropMedium

Assesses your knowledge of SQL DDL behavior and implications for data and schema management.

data managementsqlQuantiphi
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2
Behavioral & Leadership4 questions · ~42 min
Navigating Major Research RoadblocksMedium

Tests how you lead through ambiguity in research, take ownership of setbacks, and turn technical roadblocks into measurable outcomes.

roadblocksProblem SolvingadaptabilityQuantiphi
Explaining a Technical Concept ClearlyEasy

Tests communication, ownership, and stakeholder management when translating technical complexity into actionable business understanding.

Problem SolvingData Structurestechnical fundamentalsQuantiphi
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