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Materialized View - explain and use cases

SQLmedium0.4 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
NAB
Key Concepts Tested
bigqueryjoinsnowflake
Expert AnswerPremium
87 wordsInterview-ready
Materialized view: physically stores query result; pre-computed for fast reads. Unlike view, MV is not computed at query time. Use cases: expensive aggregations, dashboard precomputation, dimension pre-joins. CREATE MATERIALIZED VIEW mv AS SELECT ...; Refresh: REFRESH MATERIALIZED VIEW mv (or incremental). Trade-off: freshness vs. performance. Best for: recurring heavy queries, summary tables. Snowflake/BigQuery support automatic refresh....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like NAB. The answer also includes follow-up discussion points that interviewers commonly explore.

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