1. Define the term unique key and non-unique key give an example. (Points 5)
2. Define the terms candidate key and primary key. Explain the difference between a primary key and a candidate key. Explain the significance of the entity integrity constraint to a primary key. (Points 5)
3. Define the term referential integrity constraint, and give an example of one. How does the referential integrity constraint contribute to database integrity? (Points 5)
4. In your own words, describe the nature and purpose of the normalization process. (Points 5)