The Entity-Relationship Model - Toward a Unified View of Data

Chen, P. P. (1976). The Entity-Relationship Model - Toward a Unified View of Data. ACM, 1(1), 9-36.

Type

Journal article

Intellectual base

Primary research

Year

1976

DOI

10.1145/320434.320440

Link

https://doi.org/10.1145/320434.320440

Cited by

4 citations across 4 artifacts.

Domain-specific

• Data Model
  • Codd's relational model introduced relations, operations, and integrity concerns while separating logical representation from machine organization. Chen's entity–relationship model made entities, relationships, and attributes explicit for conceptual design.
• Entity–relationship model
  • An ER model organizes persistent domain semantics before they are translated into relational tables or another implementation schema.
• One-to-many (data model)
  • A one-to-many relationship has maximum cardinality one on one role and many on the other: one instance of A may be associated with multiple B instances, while each B is associated with at most one A in that relationship.

Mechanisms

• Schema Draft
  • … keep the "draft" and the open-question markers loud, to date and re-issue versions, and to leave the schema formally provisional until it has survived review — the opposite of the informal, free-text Concept Map, which stays deliberately un-typed because its job is to generate rather than to specify.

Verification

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