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  2. Entity–relationship model - Wikipedia

    en.wikipedia.org/wiki/Entityrelationship_model

    Diagrams created to represent attributes as well as entities and relationships may be called entity-attribute-relationship diagrams, rather than entityrelationship 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 ...

  3. Barker's notation - Wikipedia

    en.wikipedia.org/wiki/Barker's_notation

    Barker's notation refers to the ERD notation developed by Richard Barker, Ian Palmer, Harry Ellis et al. whilst working at the British consulting firm CACI around 1981. The notation was adopted by Barker when he joined Oracle and is effectively defined in his book Entity Relationship Modelling as part of the CASE Method series of books.

  4. StarUML - Wikipedia

    en.wikipedia.org/wiki/StarUML

    StarUML is a software engineering tool for ... It supports most of the diagram types specified in UML 2. ... Flowchart diagrams; Entity-Relationship diagrams (ERD) ...

  5. Comparison of database administration tools - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_database...

    Visual schema/E-R design: the ability to draw entity-relationship diagrams for the database. If missing, the following two features will also be missing; Reverse engineering - the ability to produce an ER diagram from a database, complete with foreign key relationships

  6. Database design - Wikipedia

    en.wikipedia.org/wiki/Database_design

    A sample entityrelationship diagram. One of the most common types of conceptual schemas is the ER (entityrelationship 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.

  7. Cardinality (data modeling) - Wikipedia

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

    The entityrelationship model proposes a technique that produces entityrelationship 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]

  8. IDEF1X - Wikipedia

    en.wikipedia.org/wiki/IDEF1X

    Each instance of the category entity is simultaneously an instance of the generic entity. Non-specific relationships A relationship in which an instance of either entity can be related to any number of instances of the other. View levels Three levels of view are defined in IDEF1X: entity relationship (ER), key-based (KB), and fully attributed (FA).

  9. Data modeling - Wikipedia

    en.wikipedia.org/wiki/Data_modeling

    An entityrelationship model (ERM) is an abstract conceptual representation of structured data. Entityrelationship 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 ...

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