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Explain Fact Table and Star Schema.

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
HCL
Key Concepts Tested
joinpartition
Expert AnswerPremium
80 wordsInterview-ready
**Architectural Logic**: Fact table + dimensions = star schema; optimizes analytical query patterns. **Fact Table**: Measures (amount, quantity); FKs to dimensions; large; grain defined by dimensions. Additive or semi-additive. **Star Schema**: Fact surrounded by dimension tables; denormalized dimensions; simple structure. **Example**: fact_sales (sale_id, date_key, product_key, store_key, amount, qty); dim_date, dim_product, dim_store....
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