1
Min-max constraints define the minimum and maximum number of times an entity can participate in a relationship, typically written as (min, max).
2
Additional assumptions are often required when solving ER diagram problems because the initial problem statement may not provide enough information to determine constraints for all entity types.
3
Partial participation is represented by a minimum constraint of 0, indicating that an entity instance does not have to participate in the relationship.
4
Total participation is represented by a minimum constraint of 1 (or greater), indicating that every entity instance must participate in the relationship.
5
A relationship becomes redundant if the information it conveys can be fully derived from other existing relationships and domain constraints.
6
In the second exercise, instructors teach between 2 to 4 courses, courses may use up to 5 textbooks, and textbooks are mapped with specific min-max constraints based on realistic academic assumptions.