physical datastructure, Database Management System

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what is physical data structure

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Why containment is important in oosystems? Containment is an significant concept in oosystems because it allows dissimilar users to view data at different granularities.

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What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)

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The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.

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What's the difference between a primary key and a unique key? Both primary key and unique key enforces uniqueness of the column on which they are explained. But by default prim

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