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What is meant by object identifiers?
Object-oriented systems use an object identifier to recognize objects. Object identifiers are unique: that is every object has a single identifier, and no two objects have the similar identifier.
3 assignments combined in 1
various techniques of hashing?
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Explain the concept of QBE? Query-by-example represents a visual/graphical approach for accessing information in a database by the use of query templates called as skeleton tab
What is called a query -execution engine? The query implementation engine takes a query evaluation plan, implements that plan, and returns the answers to the query.
i want to database for online assignment submission system
What is a database graph? The partial ordering implies that the set D may now be viewed as a directed acyclic graph, known as a database graph.
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
What is candidate key? Candidate Key - A candidate key of an entity set is a minimal superkey, which uniquely identifies each row in the relation.
Describe integrity and security? a) Domain constraint b) Referential integrity A value that appears in one relation for a given set of attributes also appear fo
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