A star schema is a type of relational database schema that is composed
of a single, central fact table surrounded by dimension tables.
The following figure shows a star schema with a single fact table and four
dimension tables. A star schema can have any number of dimension tables. The
multiple branches at the end of the links connecting the tables indicate a
many-to-one relationship between the fact table and each dimension table.
Figure 1. Star schema with a single fact table with links
to multiple dimension tables