What is Hierarchical database model?
[[File:Hierarchical Model.svg|thumb|360px|Example of a Hierarchical Model.]] In a '''Hierarchical database model''' is a [[data model]] where the data is organised like a [[tree (computing)|tree]]. The structure allows repeating information using parent/child relationships: each parent can have many children but each child only has one parent. All attributes of a specific record are listed under an [[entity type]]. In a database, an entity type is the equivalent of a table; each individual record is represented as a row and an attribute as a column. Entity types are related to each other using ''1:&nbsp;N'' mapping, also known as [[one-to-many]] relationships. The most recognized and used hierarchical databases are [[Information Management System|IMS]] developed by [[International Business Machines|IBM]] and [[Windows Registry]] by [[Microsoft]]. [[Category:Database modeling]]