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Specialization
The process of designating sub groupings with in an entity set is called specialization.We
use IS A relationship to represent specialization.IS
A relationship may also be referred as super class-subclass
relationship
Example: Person IS A Employee
Person IS A Customer
Employee IS A Manager
Generalization
Here the design process take place in bottom up manner.Multiple
entity sets are synthesized into a higher level entity set on the basis of common features.
Example: Employee and Customer entities can be synthesized into a higher level entity Person.
Attribute inheritance
The attributes of higher level entity set are inherited by lower level entity set.
Aggregation
Aggregation is an abstraction in which relationship sets are treated as higher level entity sets. Here a relationship set is embedded inside an entity set, and these entity sets can participate in relationships.
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