Top 27
Prep plan
Updated weekly · Last refresh Sep 22

The Trade Desk Data Analyst Interview Questions

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

27questions
~4htotal time
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1
SQL & Data ManipulationStart here. 4 questions + 2 drills · ~54 min
Schema for Cross-Device EventsHard

Tests data modeling skills for event tracking across devices in an advertising measurement context.

star schematransactionsData ModelingThe Trade Desk
Using SQL Window FunctionsMedium
Practice

Calculate three-day rolling passenger entry averages for TfL stations using aggregation and window functions.

Window FunctionsData AnalysissqlThe Trade Desk
Optimizing Slow SQL QueriesHard

Tests performance tuning skills for large-scale SQL workloads and ad-tech data volumes.

Performance Tuningquery optimizationdata integrityThe Trade Desk
Join Types and Metric IntegrityMedium

Tests understanding of join semantics and ability to prevent metric corruption in ad-tech analytics.

Metricsnull handlingJoinsThe Trade Desk
Refactoring a Slow QueryMedium
Practice
Practice drill

Refactor a slow Candid Health claims query using pre-aggregation, latest-event logic, and monthly payer metrics.

Performance Tuningdatabase optimizationCTEsCandid Health
Advanced Data Modeling for PerformanceHard
Practice
Practice drill

Calculate Citi business-unit performance variance against targets and identify the largest shortfalls.

business problemdata managementtechnical experienceCiti
2
Behavioral & Leadership20 questions · ~169 min
Handling a Basic Technical AssessmentEasy

Tests self-awareness, learning agility, and communication when handling an entry-level Linux and Python assessment.

technical assessmentlinux experiencepython experienceThe Trade Desk
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3
More topics3 questions · ~25 min
The finish line: interview-readyComplete all 27 questions plus 2 hands-on drills to finish this plan.