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Normalization: Various forms and impact on query performance

SQLmedium0.3 min readPremium
Frequency
Low
Asked at 1 company
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Zen Data Shastra
Key Concepts Tested
join
Expert AnswerPremium
64 wordsInterview-ready
Higher normalization (3NF) often increases joins, which can slow queries. Denormalization (star schema) reduces joins, improves read performance. Balance: normalize for source/ODS; denormalize for warehouse reporting. Materialized views can denormalize without base-table redundancy. **Why it matters**: Design choices compound at scale—wrong approach can cause 100× overhead. **Scalability trade-offs**: Profile before optimizing; validate on sample then full....
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