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Top 50 data validation Interview Questions

The most frequently asked data validation questions across all roles and companies, ranked by real interview frequency. Updated daily.

50questions
~17htotal time
80companies covered
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1
SQL & Data ManipulationStart here. 42 questions · ~859 min
SQL Duplicate Record CleanupMedium
Practice
Recently asked

Identify duplicate transaction rows, retain the earliest record, and delete later duplicates safely.

deduplicationdata cleaningtransactionsOracleDiscoverMicrosoft
Remove Invalid ParenthesesHard
Practice

Use a recursive CTE to return all valid Meta Reels captions after removing the fewest invalid parentheses.

postgresqldatabase queryingdata validationMeta
Top 10 Students by GPA SQLEasy
Practice

Return the 10 highest-GPA students with deterministic ordering and null GPA exclusion.

RankingSortingdatabase queryingUniversity of UtahSyracuse University
SQL and Data Manipulation AssessmentMedium
Practice
Recently asked

Prepare a latest-attempt modeling dataset with joined assessment features, missing-value counts, and outcome labels.

data preparationData ManipulationMachine LearningThe Boston Consulting Group
Validate Data IntegrityMedium
Practice

Audit transaction records for missing references, invalid values, duplicate user emails, and unusable dates before analysis.

data preparationdata anomalydata validationKeystonePaytm
Connecting Data Sources in Power BIMedium
Practice

Audit source rows for nulls, invalid values, duplicate references, and missing relationships before Power BI import.

data preparationanalytics toolsdata validationDeloitte
Debugging a Timestamp ColumnMedium
Practice

Audit raw timestamp values, identify formatting and timezone issues, and return normalized PostgreSQL timestamps.

data cleaningDate Functionsdata validationKeystone StrategyKeystone
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2
Coding7 questions · ~143 min
Validate API Response Data PointsMedium
Practice
Recently asked

Validate required nested API values using path traversal and strict type-aware comparisons.

apiProgrammingdata validationCapgemini
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3
More topics1 question · ~20 min
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