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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. File:ER Diagram MMORPG.svg - Wikipedia

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

    Draw the ER diagram for representing the information requirement of an university database: There are several colleges in the university. Each college has a name, location, and strength. A college offers many courses over two terms- Spring and Autumn- during which one or more of these courses are offered.

  4. 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.

  5. Category:Database models - Wikipedia

    en.wikipedia.org/wiki/Category:Database_models

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  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. Enhanced entity–relationship model - Wikipedia

    en.wikipedia.org/wiki/Enhanced_entity...

    This property is called the attribute and relationship inheritance. A subclass entity may have its specific attributes and relationships (together with all the attributes and relationships it inherits from the superclass). A common superclass example is a Vehicle superclass along with the subclasses of Car and Truck.

  8. Database schema - Wikipedia

    en.wikipedia.org/wiki/Database_schema

    The database schema is the structure of a database described in a formal language supported typically by a relational database management system (RDBMS). The term " schema " refers to the organization of data as a blueprint of how the database is constructed (divided into database tables in the case of relational databases ).

  9. 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)