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2. Entity–relationship model - Wikipedia

   en.wikipedia.org/wiki/Entity–relationship_model

   Two related entities shown using Crow's Foot notation. In this example, an optional relationship is shown between Artist and Song; the symbol composed of branching lines, closest to the song entity represents "zero, one, or many", whereas a song has "one and only one" Artist, emphasized by the symbol composed of parallel lines.

3. Cardinality (data modeling) - Wikipedia

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

   In this example, the three lines next to the song entity indicate that an artist can have many songs. The two vertical lines next to the artist entity indicate songs can only have one performer. In the real world, data modeling is critical because as the data grows voluminous, tables linked by keys must be used to speed up programmed retrieval ...

4. File:ERD-artist-performs-song.svg - Wikipedia

   en.wikipedia.org/wiki/File:ERD-artist-performs...

   Intended as replacement for [[Image:ERD-Crows-Foot_Artist-Song-fixed.gif]]. Captions. English. Add a one-line explanation of what this file represents.

5. 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.

6. Talk:Entity–relationship model - Wikipedia

   en.wikipedia.org/wiki/Talk:Entity–relationship...

   Proponents of IDEF(1X), Crow's Foot, Chen-style, and at least two others that I can draw but can't name, will insist that their style is the "one true ERD". The Chen style (which *is* the original) is distinguished from the others by representing relationship types explicitly as "first class objects" (nodes) rather than as lines (edges).

7. Data structure diagram - Wikipedia

   en.wikipedia.org/wiki/Data_structure_diagram

   Example of a data structure diagram. A data structure diagram (DSD) is the visual representation of a certain kind of data model that contains entities, their relationships, and the constraints that are placed on them. It is an older alternative to the entity–relationship model.

8. Sheryl Crow, 60, Rocks Sculpted Legs In A Thigh-High Slit ...

   www.aol.com/sheryl-crow-60-rocks-sculpted...

   Sheryl Crow hit the Rock & Roll Hall of Fame Induction Ceremony with strong legs in a thigh-high slit dress. The singer likes being outdoors and playing sports.

9. One-to-many (data model) - Wikipedia

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

   For example, take a car and an owner of the car. The car can only be owned by one owner at a time or not owned at all, and an owner could own zero, one, or multiple cars. One owner could have many cars, one-to-many. In a relational database, a one-to-many relationship exists when one record is related to many records of another table. A one-to ...