What is a star schema and why is it preferred in BI?

< 1 min read

Star schema is a data model where one central fact table connects to multiple dimension tables.
The structure looks like a star — Sales_Fact in center, Customer, Product, Date around it.
In my sales dashboard project, this allowed users to filter revenue by month, city, and category.
It keeps relationships simple — one-to-many joins from dimensions to fact.
BI tools like Power BI perform faster because query paths are shorter.
Measures calculate correctly and avoid double counting.
It’s easy for business users to understand compared to complex normalized tables.
Also reduces need for complex DAX or SQL logic in visuals.
That’s why star schema is the preferred model in reporting and analytics.

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