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Encyclopedia of Database Systems pp 1069–1071Cite as

Diagram

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Synonyms

Diagram; Diagrammatic Representation; Graph; Graphic

Definition

A diagram is (i) a set of symbols selected in an alphabet of elementary shapes, such as rectangles, circles, and complex shapes, built by composing elementary shapes, and (ii) a set of connections linking symbols, such as straight lines, curved lines, directed lines, etc. Diagrams are used to visualize in all aspects of data base design and usage a wide set of concepts, artifacts, schemas, values, such as conceptual schemas, logical schemas, UML diagrams, database instances, queries, results of queries.

The visual representation made possible by a diagram expresses a functional relationship between concepts represented and symbols/connections representing them. e.g., in the diagrammatic representation of Entity Relationship schemas, a rectangle is associated to an entity, a diamond is associated to a relationship.

When drawing a diagram, human beings and display devices adopt suitable drawing conventions, aesthetic...

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Recommended Reading

  1. Cruz IF, Tamassia R. Graph drawing tutorial. http://www.cs.brown.edu/~rt/

  2. Di Battista G, Eades P, Tamassia R, Tollis IG. Graph drawing. Englewood Cliffs: Prentice-Hall; 1999.

    MATH  Google Scholar 

  3. Tufte ER. The visual display of quantitative information. Cheshire: Graphic Press; 1998.

    Google Scholar 

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Author information

Authors and Affiliations

  1. University of Milano-Bicocca, Milan, Italy

    Carlo Batini

Authors
  1. Carlo Batini
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Corresponding author

Correspondence to Carlo Batini .

Editor information

Editors and Affiliations

  1. Georgia Institute of Technology College of Computing, Atlanta, GA, USA

    Ling Liu

  2. University of Waterloo School of Computer Science, Waterloo, ON, Canada

    M. Tamer Özsu

Section Editor information

  1. Dept. di Ingegneria Informatica, Automatica e Gestionale, Universita di Roma, Roma, 185, Italy

    Tiziana Catarci

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Batini, C. (2018). Diagram. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_814

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