File:Entity Relationship Diagram.jpg

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Entity_Relationship_Diagram.jpg(597 × 336 pixels, file size: 27 KB, MIME type: image/jpeg)
Description

Entity relationship (ER) diagram
A design tool that graphically expresses the database’s overall logical structure by representing data entities, their cardinality relationships (e.g., one-to-one, one-to-many, etc.), and the linkages that connect them. The construction of an ER diagram is essential for the design of database tables, extracts, and metadata (see definition of metadata). ER diagrams are especially important in designing and developing data documentation and tables that represent data relationships (see data/process flow diagram and data structure diagram).

Date
Source Data Integration Glossary.
Author U.S. Department of Transportation,

Licensing[edit]

Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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current17:58, 25 November 2008Thumbnail for version as of 17:58, 25 November 2008597 × 336 (27 KB)Mdd (talk | contribs){{Information |Description=Entity relationship (ER) diagram<br> A design tool that graphically expresses the database’s overall logical structure by representing data entities, their cardinality relationships (e.g., one-to-one, one-to-many, etc.), and t
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