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Colan Infotech Software Engineer Interview Questions

The questions to prepare for a Colan Infotech Software Engineer interview. Questions from real interview reports rank first. Updated daily.

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1
SQL & Data ManipulationStart here. 1 question + 3 drills · ~38 min
Understanding Database Indexing PurposeMedium

Explain the purpose of using indexes in databases and their impact on query performance.

CColan Infotech
UNION Two Tables and DeduplicateEasy
Practice
Practice drill

Combine Wegovy and Ozempic patient records with UNION while removing exact duplicate rows.

JoinsData WranglingUnionsNovo Nordisk
Pivot Lucid Campaign Performance by MonthMedium
Practice
Practice drill

Use joins, a CTE, CASE expressions, and monthly pivoting to compare Lucid campaign performance across channels.

pivot tablesnull handlingData WranglingLucid Motors
Unify Campaign Performance SourcesMedium
Practice
Practice drill

Use CTEs, joins, aggregations, and CASE logic to combine Salesforce, Marketo, and Google Analytics into one monthly campaign report.

Data WranglingperformanceReconciliationPalo Alto Networks
2
Data Wrangling1 question · ~8 min
UNION vs UNION ALL UsageEasy

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

Data WranglingperformanceUnionsCColan Infotech

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The finish line: interview-readyComplete all 2 questions plus 3 hands-on drills to finish this plan.