An Entity Relationship poseur, also known as an Entity Relationship Diagram, a graphical representation of entities and their kindreds to each other, typically use in computing in regard to the organization of selective information at bottom databases or information systems. An entity is a piece of data; an prey or concept about which data is stored. A relationship is how the data is sh atomic number 18d between entities. The terzetto types of relationships between entities are ace-to- adept, one-to-many, and many-to-many. One-to-one is when one precedent of an entity A is associated with one other casing of another entity B. One-to-many is when one exercise of an entity A is associated with zippo, one or many instances of another entity B, scarce for one instance of entity B there 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 Object lesson 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 properly. Another confines for Semantic Model from the field of knowledge representation is ontology: the lop of classes, relationships, and functions in a universe of discourse. If you want to get a full essay, site it on our website:
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