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Diagrams created to represent attributes as well as entities and relationships may be called entity-attribute-relationship diagrams, rather than entity–relationship models. An ER model is typically implemented as a database. In a simple relational database implementation, each row of a table represents one instance of an entity type, and each ...
The enhanced entity–relationship (EER) model (or extended entity–relationship model) in computer science is a high-level or conceptual data model incorporating extensions to the original entity–relationship (ER) model, used in the design of databases.
An entity–relationship model (ERM) is an abstract conceptual representation of structured data. Entity–relationship modeling is a relational schema database modeling method, used in software engineering to produce a type of conceptual data model (or semantic data model ) of a system, often a relational database , and its requirements in a ...
Enterprise data modelling or enterprise data modeling (EDM) is the practice of creating a graphical model of the data used by an enterprise or company. Typical outputs of this activity include an enterprise data model consisting of entity–relationship diagrams (ERDs), XML schemas (XSD), and an enterprise wide data dictionary.
Michael John Aldrich (22 August 1941 – 19 May 2014) was an English inventor, innovator and entrepreneur. [1] In 1979 he invented online shopping [2] to enable online transaction processing between consumers and businesses, [3] or between one business and another, a technique known later as e-commerce. [4]
Online shopping is a form of electronic ... English entrepreneur Michael Aldrich was a pioneer of online shopping in 1979. His system connected a modified domestic TV ...
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