Cardinality and Modality Free Essay Example
Cardinality
Cardinality indicates the maximum number of times an instance of one entity can be associated with instances in the related entity. Cardinality can have the values of one or many, no more detail than that. It is either one or more than one. On the relationship line, the cardinality is the closest to the entity box. The cardinality symbol in the diagram on the slide is in the red circle. Cardinality is indicated at BOTH ends of the relationship line, so there is a left to right cardinality and a right to left cardinality.
Modality
Modality indicates the minimum number of times an instance in one entity can be associated with an instance in the related entity. Modality can have the values of zero or one, two or three are not allowed. The modality symbol is located next to the cardinality symbol, on the inside, i.e., NOT next to the entity box. A modality of one is denoted by a straight vertical line and a modality of zero is denoted by a circle.
Like cardinality, modality is indicated at both ends of the relationship.
Top-quality papers guaranteed
100% original papers
We sell only unique pieces of writing completed according to your demands.
Confidential service
We use security encryption to keep your personal data protected.
Money-back guarantee
We can give your money back if something goes wrong with your order.
Enjoy the free features we offer to everyone
-
Title page
Get a free title page formatted according to the specifics of your particular style.
-
Custom formatting
Request us to use APA, MLA, Harvard, Chicago, or any other style for your essay.
-
Bibliography page
Don’t pay extra for a list of references that perfectly fits your academic needs.
-
24/7 support assistance
Ask us a question anytime you need to—we don’t charge extra for supporting you!
Calculate how much your essay costs
What we are popular for
- English 101
- History
- Business Studies
- Management
- Literature
- Composition
- Psychology
- Philosophy
- Marketing
- Economics
