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The image to the right is an example of a compositional structure diagram. It contains the agents Order Processor, Supplier Manager, Supplier, Online Shop and an unnamed human agent. Agents are represented by rectangles.
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 ...
An associative entity is a term used in relational and entity–relationship theory. A relational database requires the implementation of a base relation (or base table) to resolve many-to-many relationships. A base relation representing this kind of entity is called, informally, an associative table. An associative entity (using Chen notation)
Snowflake schema used by example query. The example schema shown to the right is a snowflaked version of the star schema example provided in the star schema article. The following example query is the snowflake schema equivalent of the star schema example code which returns the total number of television units sold by brand and by country for 1997.
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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.
ERD—Entity–Relationship Diagram; ERM—Entity–Relationship Model; ERP—Enterprise Resource Planning; eSATA—external SATA; ESB—Enterprise service bus; ESCON—Enterprise Systems Connection; ESD—Electrostatic Discharge; ESI—Electronically Stored Information; ESR—Eric Steven Raymond; ETL—Extract, Transform, Load; ETW—Event ...
Once a particular product has been found and selected on the website of the seller, most online retailers use shopping cart software to allow the consumer to accumulate multiple items and to adjust quantities, like filling a physical shopping cart or basket in a conventional store. A "checkout" process follows (continuing the physical-store ...