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Why star schema? Compared with snowflake schema and normalized approaches.

SQLmedium0.5 min readPremium
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Asked at 1 company
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487
questions in SQL
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1,863
across 7 categories
Asked at these companies
Daniel Wellington
Key Concepts Tested
joinsnowflake
Expert AnswerPremium
93 wordsInterview-ready
**Star schema**: One central fact table; dimensions connected directly; denormalized dimensions. **Snowflake**: Normalized dimensions (dim → sub-dim). **Normalized (3NF)**: Many tables, minimal redundancy. **Star benefits**: Simpler queries, fewer JOINs, optimized for analytics, intuitive for BI. **Snowflake** adds flexibility, reduces redundancy—useful when dimension hierarchies are complex and storage matters. **Normalized**: Less redundancy; complex for analytics....
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