problem1. describe in brief the three parts of Relational Model.

problem2. Illustrate the following terms:

i. Entity

ii. Attribute

iii. Relationship

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.