problem1. describe in brief the three parts of Relational Model.
problem2. Illustrate the following terms:
iv. Primary Key
v. Foreign Key
vi. Candidate Key
vii. Surrogate Key
problem3. The term integrity refers to accuracy or correctness of data in database. Illustrate the following terms:
i) Domain Integrity
ii) Entity Integrity
iii) Referential Integrity
problem4. What do you understand by the term recursive relationship? Give an instance of a many to many recursive relationships.