2.1. Introduction
An organisation requires an accurate and reliable data and efficient database system for effective decision-making. To achieve this goal, the organisation maintains records for its varied operations by building appropriate database models and by capturing essential properties of the objects and record relationship. Users of a database system in the organisation look for an abstract view of data they are interested in. Furthermore, since database is a shared resource, each user may require a different view of the data held in the database. Therefore, one of the main aims of a database system is to provide users with an abstract view of data, hiding certain details of how data is stored and manipulated. To satisfy these needs, ...
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