What is a star schema 

A star schema is a type of database schema used in data warehousing and business intelligence for organizing and structuring data to support efficient querying and reporting. It consists of:

1. **Fact Table:** Central table that contains quantitative data (measurable facts), such as sales revenue, quantities, or performance metrics. It records the actual business transactions and contains keys that reference dimension tables.

2. **Dimension Tables:** Surrounding tables that provide context to the data in the fact table. They include descriptive attributes such as time, product, customer, and location, allowing for detailed analysis and reporting.

3. **Star-like Structure:** The fact table is at the center, and dimension tables are directly linked to it, forming a star-like shape. Each dimension table is connected to the fact table via foreign keys.

4. **Simplicity:** This schema is designed for simplicity and ease of querying, making it well-suited for analytical queries and reporting in data warehouses.

The star schema facilitates straightforward data retrieval and analysis by providing a clear and intuitive structure for accessing business metrics and their associated dimensions.