Future users of large data banks must be protected from having to know how the data is organized in the machine (the internal representation). A prompting service which supplies such information is not a satisfactory solution. Activities of users at terminals and most application programs should remain unaffected when the internal representation of data is changed or even when external representation is changed. Changes in data representation will often be needed as a result of changes in query, update etc. Here in this paper we study the inadequacies of the tree structured files or general network data models, and this paper also provides the operations on relations to solve the problems of consistency and redundancy in the user's model.
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