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What is the difference between a view and a materialized view?

SQLmedium0.4 min read

**Architectural Logic**: View: Virtual; query runs at read time. No storage. Materialized view: Physical storage of query result; refreshed on schedule or on commit. **Why**: Views for abstraction, security, logic reuse. Materialized views for precomputed expensive aggregations,...

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Frequency
Low
Asked at 2 companies
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
PresidioSwiggy

Why This Question Matters

This medium-level SQL question appears frequently in data engineering interviews at companies like Presidio, Swiggy. While less common, it tests deeper understanding that distinguishes strong candidates.

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Expert Answer
88 words

Architectural Logic: View: Virtual; query runs at read time. No storage. Materialized view: Physical storage of query result; refreshed on schedule or on commit. Why: Views for abstraction, security, logic reuse. Materialized views for precomputed expensive aggregations, low-latency dashboards. Scalability: View scales with underlying tables. Materialized view scales with refresh strategy—incremental vs full. Cost: View has no storage cost; materialized view has storage + compute for refresh. Stale data trade-off: MV can be seconds to hours old. Use views for logic; MVs when query cost >> refresh cost.

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According to DataEngPrep.tech, this is one of the most frequently asked SQL interview questions, reported at 2 companies. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.

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