DATABASE MANAGEMENT SYSTEM: INTRODUCTION : A database system is basically just a computerized record -keeping system.The database itself can be regarded as a kind of electronic of filing cabinet; that is ,it is a repository or container for a collection of computerized data files .User of the system can perform a variety of operations involving such files -for example: Adding new files to the database Inserting data into existing files Retrieving data from existing files Deleting data from existing files Changing data in existing files WHAT IS DATABASE SYSTEM ? To repeat from the previous section, a database system is basically a computerized record -keeping system; In other words ,it is a computerized system whose overall purpose is to store information and to allow user to retrieve and update that information and to allow user to retrieve and update that information on demand.The informat...