(a) Discuss the correspondences between the ER model constructs and the relational model constructs. Show how each ER model construct can be mapped to the relational model and discuss any alternative mappings.
(b) Discuss the options for mapping EER model constructs to relations, and the conditions under which each option could be used.
a)
Correspondences between ER Model and Relational Model Constructs:
Entity Sets:
Relationships:
Attributes:
Keys:
Alternative Mappings:
b)
Options for Mapping EER Model Constructs to Relations:
Inheritance Hierarchies:
Aggregation:
Specialization/Generalization:
Union Types:
The choice of mapping options depends on the specific requirements of the application, the nature of the data model, and the desired querying and performance characteristics. The selected mapping should accurately represent the semantics of the EER model while ensuring efficient storage, retrieval, and manipulation of data in the relational model.