http://wiki.karljones.com/index.php?action=history&feed=atom&title=Hierarchical_database_model 2026-10-23T17:18:23Z Revision history for this page on the wiki MediaWiki 1.24.2 http://wiki.karljones.com/index.php?title=Hierarchical_database_model&diff=17085&oldid=prev 2016-08-23T17:14:38Z

<p>Created page with &quot;A &#039;&#039;&#039;hierarchical database model&#039;&#039;&#039; is a <a href="/index.php/Data_model" title="Data model">data model</a> in which the data is organized into a tree-like structure. The data is stored as records which are connected to one ano...&quot;</p> <p><b>New page</b></p><div>A '''hierarchical database model''' is a [[data model]] in which the data is organized into a tree-like structure. The data is stored as records which are connected to one another through links.<br /> <br /> == Description ==<br /> <br /> A record is a collection of fields, with each field containing only one value. The entity type of a record defines which fields the record contains.<br /> <br /> A record in the hierarchical database model corresponds to a row (or tuple) in the relational database model and an entity type corresponds to a table (or relation).<br /> <br /> The hierarchical database model mandates that each child record has only one parent, whereas each parent record can have one or more child records.<br /> <br /> In order to retrieve data from a hierarchical database the whole tree needs to be traversed starting from the root node.<br /> <br /> This model is recognized as the first database model created by IBM in the 1960s.<br /> <br /> == See also ==<br /> <br /> * [[Database]]<br /> * [[Data model]]<br /> * [[Hierarchical query]]<br /> * [[Hierarchical clustering]]<br /> * [[Tree structure]]<br /> <br /> == External links ==<br /> <br /> * [https://en.wikipedia.org/wiki/Hierarchical_database_model Hierarchical database model] @ Wikipedia<br /> <br /> [[Category:Computer science]]<br /> [[Category:Databases]]</div>

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