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country bumpkin
A hierarchical database model is a data model in which the data is organized into a tree-like structure. The structure allows representing information using parent/child relationships: each parent can have many children, but each child has only one parent (also known as a 1-to-many relationship). All attributes of a specific record are listed under an entity type.
Example of a hierarchical model
In a database an entity type is the equivalent of a table. Each individual record is represented as a row, and each attribute as a column. Entity types are related to each other using 1:N mappings, also known as one-to-many relationships. This model is recognized as the first database model created by IBM in the 1960s.
Currently the most widely used hierarchical databases are IMS developed by IBM and Windows Registry by Microsoft.
More info here>>http://en.wikipedia.org/wiki/Hierarchical_database_model
| 13 years ago. Rating: 5 | |
