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"The entity-relationship model adopts the more natural view that the real world consists of entities and relationships. It incorporates some of the important semantic information about the real world." [2] In his original 1976 article Chen explicitly contrasts entity–relationship diagrams with record modelling techniques:
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Cooperative (aguda shitufit, אגודה שיתופית) – entity which may pursue profit, but with certain legal properties meant to facilitate greater participation by each shareholder, or member, in the entity's affairs. Shareholders usually have an additional relationship with the cooperative, such as employees or consumers.
A sample entity–relationship diagram. One of the most common types of conceptual schemas is the ER (entity–relationship model) diagrams. Attributes in ER diagrams are usually modeled as an oval with the name of the attribute, linked to the entity or relationship that contains the attribute.
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The representation on the multiple structures of parts, groups, groups of parts or parts of entity groups that form the supra-entity is done through strips connecting the different elements, instead of the usual line symbol used for a single structure in the entity-relationship models. [3] For example, supra-entity Products in a business sector ...
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)
The SERM (structured entity relationship model) is an amplification of the ERM which is commonly used for data modeling. It was first proposed from Prof. Dr. Elmar J. Sinz in 1988. The SERM is commonly used in the SAP -world for the data modeling .