There are many kinds of relationships in a design model of a database. The most common are one-to-one (1:1), one-to-many (1:N), and many-to-many (N:

There are many kinds of relationships in a design model of a database. The most common are one-to-one (1:1), one-to-many (1:N), and many-to-many (N:M). Some of the entity types can be ID-Dependent, Strong, Weak, or Subtype Entities. 1. Why is it important to classify each of these types in an ERD Model?