0
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.
Add your answer:
Earn +20 pts
What is the cost of perkins braille typewriter?
Perkins Braillers typically range in price from around $700 to $1,000, depending on the model and any additional features.
Our model of the surfaces features of venus was obtained by?
Our model of the surface features of Venus was obtained by the radar.
What does a vermeer 24x40 a weigh?
A Vermeer 24x40A trencher typically weighs around 6,000 to 7,000 pounds, depending on the specific model and any additional attachments or features.
What is the difference between Mercedes Avantgarde and Classic?
Avantgarde is a higher spec which means it may have additional features such as parking sensors and cruise control. Avantgarde is not necessiraly a higher spec model..avantgarde means the sport model..the higher spec would be the elegance and the classic is the base model....
What are the features of a networked organization model?
The three features of a networked organization model are borderless, collaborative, and pervasively-networked.
What is a bulova Y34049?
It appears that "Bulova Y34049" is a model number for a specific Bulova watch. Additional information such as features, materials, and design specifics would provide a more detailed description of the watch.
How much did a new car?
It depends entirely on where it was bought, when it was boought, what make and model the car was, what additional features the care may have had and how effective a negotiator the buyer and seller were. Please resubmit this question with those details.
How much does a stopwatch weigh?
A basic digital stopwatch typically weighs around 2-4 ounces. However, this can vary depending on the brand, model, and additional features such as a durable casing or extra functions.
How much does a minimax go kart weigh?
A minimax go-kart typically weighs around 150-200 pounds, depending on the specific model and any additional features or modifications.
What is IAP Model?
An IAP (In-App Purchase) model refers to a business model where users can make purchases within a mobile app, typically for additional features, content, or virtual goods. It allows app developers to generate revenue by providing a free app with the option for users to make purchases within the app.
How Much Did a New Car Cost?
It depends entirely on where it was bought, when it was boought, what make and model the car was, what additional features the care may have had and how effective a negotiator the buyer and seller were. Please resubmit this question with those details.
What is the average weight of a sedan?
The average weight of a sedan is around 3,300 to 3,700 pounds. This can vary depending on the make and model of the sedan, as well as any additional features or options.
