Database Basics

Network Model

This is an extension of the Hierarchical model. In this model data is organised more like a graph, and are allowed to have more than one parent node. In this database model data is more related as more relationships are established in this database model. Also, as the data is more related, hence accessing the data is also easier and fast. This database model was used to map many-to-many data relationships.

Relational Model

A database model that describes data in which all data elements are placed in two-dimensional tables, called relations, which are the logical equivalent of files.

Hierarchical Model

An early database model whose basic concepts and characteristics formed the basis for subsequent database development. This model is based on an upside-down tree structure in which each record is called a segment. The top record is the root segment. Each segment has a 1:M relationship to the segment directly below it.

Entity-relationship Model

Graphical representation of entities and their relationships in a database structure.