TEKsystems Data Analyst Interview Questions

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

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PipelinesStart here. 3 questions · ~26 min

Implement Power BI Row-Level SecurityHard

Design and test row-level security for a multi-tenant Power BI workspace with tenant-aware data access and auditability.

InfrastructureData ModelingQuality

TEKsystems

Diagnose Slow Dashboard PipelinesEasy

Approach for finding and fixing a slow dashboard pipeline, from source ingestion to warehouse queries.

InfrastructureToolsQuality

TEKsystems

Model Recycled Material ContentHard

Tests data modeling skills for complex, multi-facility traceability and reporting requirements.

supply chainData Modeling

TEKsystems

SQL & Data Manipulation6 questions + 2 drills · ~71 min

Optimize Large PostgreSQL Query PerformanceMedium

Explain how to tune slow PostgreSQL queries on multi-million-row tables using indexes, execution plans, joins, and partitioning.

Performance Tuningquery optimizationsql

TEKsystems

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 By

TEKsystems

SQL vs Java SkillsEasy

Evaluates your core programming and query skills relevant to data analysis.

javasql

TEKsystems

SQL Execution OrderHard

Practice

Practice drill

Explain SQL logical execution order and demonstrate it with filtering, aggregation, ranking, sorting, and limiting.

Group Bysqldatabase querying

TEKsystems

SQL: Deleting Duplicate RecordsMedium

Practice

Practice drill

Delete duplicate PostgreSQL records while retaining the row with the smallest record ID.

data cleaningData Manipulationsql

TEKsystems

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Behavioral & Leadership12 questions · ~102 min

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