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Top 50 databases Interview Questions

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

50questions
~7htotal time
153companies covered
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1
SQL & Data ManipulationStart here. 24 questions + 1 drill · ~214 min
SQL vs NoSQL DifferencesEasy
Practice
Recently asked

Query a comparison table to present the key structural and operational differences between SQL and NoSQL databases.

nosqlJoinsData WranglingCogitoRamsey SolutionsPyramid Consulting
Relational vs Non-Relational DatabasesEasy
Practice

Produce a structured SQL comparison of relational and non-relational database characteristics.

nosqldatabasesdatabase conceptsAlgoliaEEtech
Data Integrity in Migration ValidationMedium
Recently asked

Explain how to preserve data integrity during a large database migration using reconciliation queries, joins, CTEs, and transaction controls.

data migrationdatabasesdata integrityDoorDashBBank of ChinaCCybage Software
SQL vs NoSQL for Banking DataEasy
Recently asked

Explain how relational SQL databases differ from NoSQL systems in schema, consistency, and scaling for banking workloads.

performancedatabasesData ModelingFetchFinacleSStandard Chartered Bank
SQL vs NoSQL for Deloitte SystemsMedium
Recently asked

Explain how SQL and NoSQL differ in schema, consistency, scaling, and use cases for enterprise data platforms.

nosqlsqldatabasesVodafoneDeloitteHHutchinson
Optimize Slow SQL QueriesMedium

Tests query tuning skills using execution plans, indexing, and rewrite strategies.

Performance Tuningquery optimizationdatabasesZetaProvidence IndiaFreecharge
Top Users by Recent Transaction VolumeMedium
Practice
Recently asked
Practice drill

Find the top 3 users by completed transaction volume in the last 30 days using joins and aggregation.

Data Analysisquery optimizationsqlTTier 1 BankRevolutChime
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2
Coding6 questions · ~51 min
Core Coding Concepts CoverageMedium
Recently asked

Tests your foundational coding and security knowledge across common enterprise areas.

SecuritydatabasesoopSage
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3
Security & Infrastructure3 questions · ~26 min
Explain TCP vs UDP and Data StoresMedium

Evaluates your core networking and data modeling tradeoff knowledge.

databasesDigitalOcean
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4
Technical Fundamentals5 questions · ~43 min
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5
System Design5 questions · ~43 min
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6
Behavioral & Leadership7 questions · ~60 min
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The finish line: interview-readyComplete all 50 questions plus 1 hands-on drill to finish this plan.