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Updated weekly · Last refresh Oct 17

Sii Netherlands Data Analyst Interview Questions

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

16questions
~2htotal time
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1
SQL & Data ManipulationStart here. 6 questions + 3 drills · ~78 min
Ensuring SQL Data AccuracyEasy

Explain how to ensure data accuracy in SQL workflows using validation checks, reconciliation, and careful query design.

JoinsData WranglingQualitySii Netherlands
Cleaning and Preparing Messy DataMedium

Tests data cleaning methodology, quality checks, and readiness for analysis.

data preparationdata cleaningdata integritySii Netherlands
Resolving Post-Delivery Report DiscrepanciesMedium

Tests incident triage, communication, and data validation to correct reporting errors.

Stakeholder ManagementProblem Solvingdata integritySii Netherlands
Top Three Categories QueryMedium

Tests practical SQL querying ability for ranking and aggregation tasks.

sql queriesdata extractionperformance analysisSii Netherlands
Optimizing SQL on Large DataMedium

Tests SQL performance tuning skills on large datasets and practical optimization strategies.

Performance TuningData ManipulationSii Netherlands
Choosing the Right SQL JoinsMedium

Tests understanding of SQL join semantics and correct selection for analysis needs.

Data ManipulationSii Netherlands
Update Employee Sex Codes in SQLEasy
Practice
Practice drill

Correct employee sex codes while preserving NULL and other existing values.

data cleaningData Manipulationsql queriesIon Group
Remove Duplicates Without DroppingMedium
Practice
Practice drill

Identify and delete duplicate staging rows while retaining the earliest record and preserving the table.

deduplicationdata cleaningData ManipulationVerizon
SQL Value SwappingMedium
Practice
Practice drill

Swap two column values for approved rows while preserving unaffected records and returning before-and-after values.

SubqueriesJoinsData ManipulationNeenOpal

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2
Behavioral & Leadership10 questions · ~80 min
Handling Pushback on Data InsightsMedium

Tests stakeholder management and communication when data insights are challenged, including how you respond to feedback and drive alignment.

Influence Without AuthorityStakeholder ManagementCommunicationSii Netherlands
Explaining Technical Issues ClearlyMedium

Tests whether you can translate technical complexity into business-relevant language for non-technical stakeholders and drive action.

Stakeholder ManagementCommunicationtechnical explanationSii Netherlands
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The finish line: interview-readyComplete all 16 questions plus 3 hands-on drills to finish this plan.