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Updated weekly · Last refresh Oct 17

Ion Group Consultant Interview Questions

The questions to prepare for a Ion Group Consultant interview. Questions from real interview reports rank first. Updated daily.

16questions
~2htotal time
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1
SQL & Data ManipulationStart here. 5 questions + 2 drills · ~64 min
Second Highest Without AggregatesHard
Practice

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

SubqueriesRankingSelf-JoinsIon Group
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 ByIon Group
Normalization for Clean SchemasMedium

Tests ability to design maintainable relational schemas and reduce anomalies.

normalizationdatabase designdata integrityIon Group
Database Indexes and Query SpeedMedium

Tests understanding of indexing strategies and their impact on SQL query performance.

Performance Tuningindexesdatabase designIon Group
Handling NULLs in SQLEasy

Tests knowledge of SQL NULL semantics and safe calculation patterns.

null handlingData WranglingIon Group
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
Analyze Customer Purchase Trends with Window FunctionsEasy
Practice
Practice drill

Calculate the monthly spending trends for customers using window functions and joins.

The Home DepotAvisoHewlett Packard Enterprise
2
Behavioral & Leadership9 questions · ~79 min
Owning a Project MistakeMedium

Tests ownership after a project mistake, especially how you communicate bad news, recover trust, and drive a concrete resolution.

Conflict ResolutionCommunicationOwnershipIon Group
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3
More topics2 questions · ~18 min
Projecting Revenue From TrendsMedium

Tests analytical reasoning with time-series trends to forecast revenue growth for Ion Group clients.

ForecastingTime SeriesIon Group
Calculating Multi-Year Compound GrowthMedium

Tests quantitative skills for computing compound growth relevant to Ion Group client metrics.

financial dataIon Group

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The finish line: interview-readyComplete all 16 questions plus 2 hands-on drills to finish this plan.