Question

which of the following is a key part of logical design in an entity relationship model? a.) this model is a global view of the entire database that describes the main objects while avoiding details. b.) this model includes all entities and relationships between those entities. c.) this model simply states the relationships but does not specify them. d.) this model defines both the data types and sizes.

Answer 1

The key part of logical design in an entity-relationship model is that b. it includes all entities and relationships between those entities. Logical design serves as a blueprint for the actual database implementation and is crucial for database consistency and structure planning.

Step-by-step explanation:

A key part of logical design in an entity-relationship model (ERM) is that it includes all entities and the relationships between those entities. Specifically, the correct answer to the question is option b.) this model includes all entities and relationships between those entities. For clarity, logical design in database modeling focuses on structuring the data without regard to the physical means by which the data will be stored. It concentrates on detailing the entities, the datatypes of attributes of these entities, and the relationships among entities.

Logical design is essential as it serves as a blueprint for the database's actual implementation at the physical level. It ensures consistency in understanding the data structure throughout the development process and provides a guide for developers and database administrators to implement the database system.

An entity-relationship model is an abstract and conceptual representation of data that helps in database planning and serves as the groundwork upon which the physical database is built.