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2. Entity–relationship model - Wikipedia

   en.wikipedia.org/wiki/Entity–relationship_model

   An entity–relationship model (or ER model) describes interrelated things of interest in a specific domain of knowledge. A basic ER model is composed of entity types (which classify the things of interest) and specifies relationships that can exist between entities (instances of those entity types).

3. Cardinality (data modeling) - Wikipedia

   en.wikipedia.org/wiki/Cardinality_(data_modeling)

   The entity–relationship model proposes a technique that produces entity–relationship diagrams (ERDs), which can be employed to capture information about data model entity types, relationships and cardinality. A Crow's foot shows a one-to-many relationship. Alternatively a single line represents a one-to-one relationship. [4]

4. Comparison of data modeling tools - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_data...

   Update database and/or update model No NORMA Object-Role modeling Conceptual (ORM), Logical, Physical ORM, Relational(Crow’s foot option), Barker Yes Yes Update database and/or update model No Open ModelSphere: Conceptual, Logical, physical IDEF1X, IE (Crow’s foot), and more Yes Yes Update database and/or update model No

5. erwin Data Modeler - Wikipedia

   en.wikipedia.org/wiki/Erwin_Data_Modeler

   erwin Data Modeler (stylized as erwin but formerly as ERwin) is computer software for data modeling.Originally developed by Logic Works, erwin has since been acquired by a series of companies, before being spun-off by the private equity firm Parallax Capital Partners, which acquired and incorporated it as a separate entity, erwin, Inc., managed by CEO Adam Famularo.

6. IDEF1X - Wikipedia

   en.wikipedia.org/wiki/IDEF1X

   The initial approach to IDEF information modeling (IDEF1) was published by the ICAM program in 1981, based on current research and industry needs. The theoretical roots for this approach stemmed from the early work of Edgar F. Codd on Relational model theory and Peter Chen on the entity-relationship model.

7. Data modeling - Wikipedia

   en.wikipedia.org/wiki/Data_modeling

   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 ...

8. ER/Studio - Wikipedia

   en.wikipedia.org/wiki/ER/Studio

   The software includes features to graphically modify the model, including dialog boxes for specifying the number of entity–relationships, database constraints, indexes, and data uniqueness. [2] ER/Studio supports four data modeling languages: IDEF1X , two variants [ citation needed ] of information technology engineering developed by James ...

9. Peter Chen - Wikipedia

   en.wikipedia.org/wiki/Peter_Chen

   The entity–relationship model serves as the foundation of many systems analysis and design methodologies, computer-aided software engineering (CASE) tools, and repository systems. The ER model is the basis for IBM 's Repository Manager/MVS and DEC 's CDD/Plus .