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Updated weekly · Last refresh Sep 25

Pcs Research Group Data Engineer Interview Questions

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

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1
normalizationStart here. 2 questions · ~16 min
Normalization Forms ExplainedMedium

Assesses your understanding of relational normalization and when to apply each normal form.

normalizationdatabase designPcs Research Group
Understanding Third Normal FormMedium

Tests your knowledge of 3NF constraints and how they prevent data anomalies.

normalizationdatabase designPcs Research Group
2
Joins1 question · ~8 min
Joining Tables in SQLEasy

Tests your ability to write correct SQL joins for relational data retrieval.

Joinssql queryPcs Research Group

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Second Highest Trader SalaryEasy
Practice
Practice drill

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksNNeenOpal CanadaInformatica
Second Highest Without AggregatesHard
Practice
Practice drill

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCredit GenieDevoteamCisco Restaurant + Bar
SQL Query OptimizationMedium
Practice
Practice drill

Optimize a slow PostgreSQL query that aggregates completed transactions while preserving customers with no matching activity.

Performance Tuningdatabase optimizationindexesDDroisysCapgeminiNomura
The finish line: interview-readyComplete all 3 questions plus 3 hands-on drills to finish this plan.