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  2. Entity–relationship model - Wikipedia

    en.wikipedia.org/wiki/Entityrelationship_model

    Rather, they show entity sets (all entities of the same entity type) and relationship sets (all relationships of the same relationship type). For example, a particular song is an entity, the collection of all songs in a database is an entity set, the eaten relationship between a child and his lunch is a single relationship, and the set of all ...

  3. 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]

  4. File:ER Diagram MMORPG.svg - Wikipedia

    en.wikipedia.org/wiki/File:ER_Diagram_MMORPG.svg

    A sample Entity-relationship diagram using Chen's notation. A sample Entity-relationship diagram. A sample ER diagram.}} {{ko|ER 다이어그램 예제.}} {{ru|Простая ER-мо

  5. 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.

  6. Database model - Wikipedia

    en.wikipedia.org/wiki/Database_model

    Thus, the "relation" in "relational database" refers to the various tables in the database; a relation is a set of tuples. The columns enumerate the various attributes of the entity (the employee's name, address or phone number, for example), and a row is an actual instance of the entity (a specific employee) that is represented by the relation.

  7. Associative entity - Wikipedia

    en.wikipedia.org/wiki/Associative_entity

    An associative entity is a term used in relational and entityrelationship 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)

  8. One-to-one (data model) - Wikipedia

    en.wikipedia.org/wiki/One-to-one_(data_model)

    A country has only one capital city, and a capital city is the capital of only one country. (Not valid for some countries).. In systems analysis, a one-to-one relationship is a type of cardinality that refers to the relationship between two entities (see also entityrelationship model) A and B in which one element of A may only be linked to one element of B, and vice versa.

  9. Exclusive relationship (programming) - Wikipedia

    en.wikipedia.org/wiki/Exclusive_relationship...

    A Data (Entity A) could be Sent (Relationship Name) to a Monitor (Entity B) or a Printer (Entity C) to be shown. In this case, the relationship between the Monitor and Printer at one side and Data at the other side is an Exclusive Relationship. Of course it is assumed that Data could be sent to only one of the targets at a time, not to both.