Tuesday, January 28, 2014

Entity-Relationship model vs. Semantic Object model

An Entity Relationship put, also known as an Entity Relationship Diagram, a graphical representation of entities and their kindreds to each other, typically employ in computing in regard to the organization of data 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 threesome types of relationships between entities are ace-to- integrity, 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 spokesperson of an entity A is associated with adjust, one or many instances of another entity B, plainly 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 mannikin 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, edict it on our website: OrderCustomPaper.com

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