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Updated weekly · Last refresh Nov 6
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Emergys Data Engineer Interview Questions

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

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~2htotal time
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1
Technical FundamentalsStart here. 4 questions · ~32 min
HBase and Spark Architecture ConceptsMedium

Tests understanding of integrated big data components and their tradeoffs.

sparkarchitectureEEmergys
HBase vs HiveMedium

Assesses understanding of NoSQL vs SQL-on-Hadoop concepts.

data storageEEmergys
Big Data ArchitectureMedium

Tests knowledge of distributed storage and processing stack.

sparkarchitectureEEmergys
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2
Pipelines4 questions · ~32 min
AWS Glue TroubleshootingMedium

Measures problem solving and operational debugging in serverless ETL.

data pipelinesTroubleshootingEEmergys
CI/CD in AzureMedium

Assesses DevOps practices for data engineering workloads.

data pipelinesCI/CDEEmergys
AWS Glue - Troubleshooting and CreationMedium

Assesses practical knowledge of Glue ETL development.

data pipelinesTroubleshootingEEmergys
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3
Behavioral & Leadership3 questions · ~24 min
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4
More topics2 questions · ~16 min
UNION vs UNION ALL UsageEasy

Explain how UNION and UNION ALL differ when combining result sets, especially around duplicate handling and performance.

Data WranglingperformanceUnionsEEmergys
Difference Between WHERE and HAVING ClausesEasy

Explain the differences between WHERE and HAVING clauses in SQL and when to use each.

JoinsData WranglingAggregationsEEmergys

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL Query PracticeEasy
Practice
Practice drill

Return the second-highest distinct non-null salary from a single employee table.

null handlingsqldatabase queryingBBureau VeritasPayUItc Infotech
Optimizing Slow SQL or SparkMedium
Practice
Practice drill

Rewrite a slow PostgreSQL aggregation and explain how to validate its performance with execution plans and indexing.

Performance Tuningdatabase optimizationJoinsStarbucks
Advanced SQL TopicsHard
Practice
Practice drill

Use joins, aggregation, CTEs, ranking, and CASE logic to summarize customer sales by region.

JoinsCTEsData StructuresWalmart Global Tech
The finish line: interview-readyComplete all 13 questions plus 3 hands-on drills to finish this plan.