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Generalization is the process of extracting common properties from a set of entities and create a generalized entity from it. It is a bottom-up approach in which two or more entities can be generalized to a higher level entity if they have some attributes in common.
It is a diagrammatic technique for displaying the Sub Class and Super Class; Specialization and Generalization; Union or Category; Aggregation etc. These are very common relationship found in real entities. However this kind of relationships was added later as enhanced extension to classical ER model.
Apr 28, 2015 · Extended E-R Features Although the basic E-R concepts can model most database features, some aspects of a database may be more aptly
Basic E-R model is good for many uses. • Several extensions to E-R model for more advanced modeling. – Generalization and specialization. – Aggregation.
The above book club example is converted into an E-R diagram as shown in Fig. 3.17. Summary ® The Entity Relationship (E-R) model is a high-level
building software size model to estimate the size of source code for a data-intensive system based on extended ER diagram. It also discusses the validation
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