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What (who) is hierarchical database - definition

TREE-LIKE DATABASE MODEL

Hierarchical database; Hierarchical data model; List of hierarchical database management systems; Tree database; Hierarchical database management system; Hierarchical models; Hierarchical data; Hierarchical model

hierarchical database

<database> A kind of database management system that links records together like a family tree such that each record type has only one owner, e.g. an order is owned by only one customer. Hierarchical 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.

Hierarchical database model

A hierarchical database model is a data model in which the data are organized into a tree-like structure. The data are stored as records which are connected to one another through links.

https://en.wikipedia.org/wiki/Hierarchical_database_model

Hierarchical clustering

METHOD OF CLUSTER ANALYSIS WHICH SEEKS TO BUILD A HIERARCHY OF CLUSTERS

Hierarchical Clustering; Agglomerative hierarchical clustering; Hierarchical Cluster Analysis; Hierarchical cluster analysis; SLINK; Agglomerative clustering; Divisive clustering; Hierarchical agglomerative clustering

In data mining and statistics, hierarchical clustering (also called hierarchical cluster analysis or HCA) is a method of cluster analysis that seeks to build a hierarchy of clusters. Strategies for hierarchical clustering generally fall into two categories:

https://en.wikipedia.org/wiki/Hierarchical_clustering

Wikipedia

Hierarchical database model

A hierarchical database model is a data model in which the data are organized into a tree-like structure. The data are stored as records which are connected to one another through links. A record is a collection of fields, with each field containing only one value. The type of a record defines which fields the record contains.

The hierarchical database model mandates that each child record has only one parent, whereas each parent record can have one or more child records. In order to retrieve data from a hierarchical database, the whole tree needs to be traversed starting from the root node. This model is recognized as the first database model created by IBM in the 1960s.

https://en.wikipedia.org/wiki/Hierarchical database model