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(a) Explain briefly the three parts of a relational Model.
(b) Contrast the following terms with an appropriate example:
(i) stored attribute v/s derived attribute (ii) entity type v/s entity instance (iii) strong entity type v/s weak entity type (iv) simple attribute v/s composite attribute (v) unary relationship v/s binary relationship.
(c) The term integrity refers to the accuracy or correctness of the data in the database. Define the following terms:
(i) Domain Integrity (ii) Entity Integrity (iii) Referential Integrity.
(d) Constraints are rules that restrict the data values that you can enter into a field in a database table. Briefly describe the following constraint with appropriate example for each:
(i) Check Constraint (ii) Not Null Constraint (iii) Unique Constraint
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