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Ion Group Consultant Interview Questions

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

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
Database Indexes and Query SpeedMedium

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

Performance Tuningindexesdatabase designIon Group
Normalization for Clean SchemasMedium

Tests ability to design maintainable relational schemas and reduce anomalies.

normalizationdatabase designdata integrityIon Group
Handling NULLs in SQLEasy

Tests knowledge of SQL NULL semantics and safe calculation patterns.

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

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

The Home DepotAvisoWorld Wide Technology
SQL for Customer Order TotalsEasy
Practice
Practice drill

Use GROUP BY and SUM to calculate total order value for each Fidessa customer, including unknown customers.

aggregationsqlIon Group
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
Calculating Multi-Year Compound GrowthMedium

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

financial dataIon Group
Projecting Revenue From TrendsMedium

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

ForecastingTime SeriesIon Group

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