File:Hierarchical Model.svg

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Summary

Description

English: Hierarchical Model. A data model that do not link records together like a family tree, but each record type has only one owner (e.g., a purchase order is owned by only one customer). Hierarchical data structures were widely used in the first mainframe database management systems. However, due to their restrictions, they often cannot be used to relate structures that exist in the real world.

Date

August 2001

Source

http://knowledge.fhwa.dot.gov/tam/aashto.nsf/All+Documents/4825476B2B5C687285256B1F00544258/$FILE/DIGloss.pdf, page 10.

Author

U.S. Department of Transportation
vectorization: Own work

Permission
(Reusing this file)

	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.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

File history

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	10:55, 31 December 2011		548 × 313 (8 KB)	Razorbliss	typo
	10:07, 31 December 2011		548 × 313 (8 KB)	Razorbliss	== Summary == {{Information \|Description ={{en\|1=''Hierarchical Model.'' A data model that links records together like a family tree, but each record type has only one owner (e.g., a purchase order is owned by only one customer). Hierarchical data stru