Which of the following statements is true regarding dimensional models compared to ER models?

The assertion about star schemas having fewer relations is accurate because star schemas are a hallmark of dimensional modeling, which is specifically designed for analytical purposes and optimized for speed and simplicity in querying data. In a star schema, a central fact table is directly connected to multiple dimension tables, forming a structure that resembles a star. This setup typically results in fewer relationships compared to entity-relationship (ER) models, which often include many-to-many relationships and complex normalization to reduce data redundancy.

Dimensional models prioritize ease of understanding and querying over strict data normalization, which is more characteristic of ER models. Consequently, when querying a star schema, users can achieve faster results due to the simplicity of its structure, enhancing performance in analytical querying scenarios. Therefore, this simplicity and reduced number of relationships make star schemas effective for reporting and analysis.