Which dimensional schema has fewer relations and is typically easier to query?

The star schema is characterized by its simple structure and ease of use, which makes it particularly user-friendly for querying. In a star schema, the central fact table is directly connected to multiple dimension tables. This design minimizes the number of relationships and joins needed, thereby simplifying SQL queries.

Since the dimension tables are not normalized, the data redundancy may be higher, but this trade-off results in quicker access to data and straightforward querying processes. Users can directly reference the relevant dimensions needed without navigating through complex multi-level relationships.

In contrast, options like the snowflake schema, galaxy schema, or network schema involve more complex relationships and often require additional joins to retrieve information, making them more cumbersome for users.