Exercises

Answer the following questions

1. What is the purpose of using the E-R model.

2. What is the difference between a weak entity and a regular entity.

3. List and explain the different types of attributes that can be represented in an E-R model.

4. Explain the relation between a subtype entity and a supertype entity.

5. Explain the following terms:

   a. Total relationship
   b. Cardinality Ratio
   c. Relationship degree