Question

consider the er diagram in the figure 1 which model and online book store list the entity sets and their primary key​

Answer 1

Explanation:

At a basic level, databases store information about distinct objects, or entities, and the associations, or relationships, between these entities. For example, a university database might store information about students, courses, and enrollment. A student and a course are entities, while an enrollment is a relationship between a student and a course. Similarly, an inventory and sales database might store information about products, customers, and