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Top 50 database design Interview Questions

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

50questions
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97companies covered
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1
SQL & Data ManipulationStart here. 26 questions · ~237 min
Attendance Management Schema and SQLMedium
Practice

Design two attendance tables and write simple PostgreSQL queries for employee presence, absences, and daily summaries.

Joinsdatabase designAggregationsAmazon Web Services
Top 10 Customers by SalesMedium
Practice

Design a schema and rank the top 10 customers by sales volume over the past month.

Date Functionsdatabase designAggregationsMicrosoft
Handle Hash Table CollisionsMedium
Practice

Explain what a hash table collision is and how to handle it.

database optimizationdatabase designdatabase conceptsMicrosoft
Primary Key vs Foreign KeyEasy
Recently asked

Tests relational database fundamentals and how keys enforce data integrity.

database designdata integrityMMindfire SolutionsQADFast Enterprises
Normalization in Trade Data ModelsEasy
Recently asked

Explain normalization, why it improves data integrity, and how it shapes relational trade data design.

normalizationsqldatabase designeeClerxMufg - Mitsubishi Ufj Financial GroupArch Capital
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2
Coding4 questions · ~36 min
Prime Numbers and String-to-IntHard
Practice

Generate all primes with a sieve and manually parse a signed integer without int(), strip(), or digit helpers.

database designAlgorithmsCCornerstone OnDemand
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3
Technical Fundamentals3 questions · ~27 min
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4
System Design13 questions · ~118 min
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5
More topics4 questions · ~36 min
Choosing the Right Database Under LoadMedium
Recently asked

Tests technical decision-making, ownership, and communication when choosing between relational and NoSQL databases for a high-throughput system.

Decision Makingtechnical experiencedatabase designCaris Life SciencesWest MonroePepsiCo
Break Down Fleet Ops PlatformMedium
Recently asked

Translate a high-level operational requirement into concrete services, data stores, and client interactions with clear execution trade-offs.

system designservice architecturedatabase designPalantir technologies
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