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What is E-R model? This data model is based on real world that having of basic objects called entities and of relationship between these objects. Entities are explained in a da
limitations and benefits in database tecknowlagy
Which operator is Cartesian product in relational algebra? Cartesian product in relational algebra is a binary operator. (It requires two operands. e.g., P X Q)
Design a gennalization and specialization hierarchy for an automobile sales company
Define object-relational systems? Systems that give object-oriented extensions to relational systems are known as object-relational systems.
List the data structures implemented by the storage manager. The storage manager executes the following data structure a) Data files b) Data dictionary c) indices
Explain three main attributes of data.
Define upgrade and downgrade? It gives a mechanism for conversion from shared lock to exclusive lock is called as upgrade. It gives a mechanism for conversion from exclusive
Write A short note on temporary tables? Temporary Tables - Temporary tables exists solely for a particular session, or whose data persists for the duration of the transaction
What is the difference among a database schema and a database state? The collection of information stored in database at particular moment in time is known as database state a
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