March 2022
Intermediate to advanced
682 pages
22h 58m
English
Content preview from Databases Illuminated, 4th Edition
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4.8 Mapping an Extended Entity-Relationship (EER) Model to a Relational Schema
The techniques discussed in Section 4.7 for mapping an ER model to a relational model apply to the EER model, but they must be extended to take into account the additional features of the EER model, namely specialization/generalization and union.
4.8.1 Summary of ER to Relational Mapping Concepts
For entity sets and relationships that are not part of generalizations or unions, the mapping proceeds as for the ER model.
Map strong entity sets to tables having a column for each single-valued, noncomposite attribute.
For composite attributes, create a column for each component and do not represent the composite. Alternatively, create a single column for the composite ...
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