Entity-Relationship model vs. Semantic Object model

An Entity Relationship Model, also cognize as an Entity Relationship Diagram, a graphical representation of entities and their kindreds to apiece other, typically used in computing in inclination to the organization of selective information at bottom databases or learning systems. An entity is a piece of data; an prey or fancy about which data is stored. A relationship is how the data is sh nuclear number 18d between entities. The collar types of relationships between entities ar ace-to- adept, wizard(a)-to- many an(prenominal) an(prenominal), and many-to-many. One-to-one is when one precedent of an entity A is associated with one other casing of another(prenominal) entity B. One-to-many is when one congressman of an entity A is associated with zero, one or many grammatical cases of another entity B, but for one instance of entity B on that point is only one instance of entity A. Many-to-many is when one instance of an entity A is associated with one, zero or many instances of another entity B, and one instance of entity B is associated with one, zero or many instances of entity A.

A semantic endeavor Model is developed from disapproves that are already known. This dumbfound is normally used to document a system, program, or object that is already in use and working(a) properly. Another confines for semantic Model from the field of experience representation is ontology: the lop of classes, relationships, and functions in a universe of discourse. If you demand to get a blanket(a) essay, order it on our website: Orderessay

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