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ERD definition

 According to Li and Chen (2009), ERD is a diagram that shows how different things in a database relate to each other.These terms are related to ERD:

  • Entities are the things being modeled, like customers or products. 
  • Attributes are the characteristics of an entity, like its name or size. 
  • Cardinalities show how many of one thing are related to another, like one-to-many or many-to-many. 
  • Relationships show how entities are connected, and can be one-to-one, one-to-many, or many-to-many.
ERDs are helpful for designing and building a database that meets the needs of a business or organization.

References: 

Li, Q. and Chen, Y.L., 2009. Entity-relationship diagram. In Modeling and analysis of enterprise and information systems (pp. 125-139). Springer, Berlin, Heidelberg.

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