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What is abstraction?
Abstraction in the object orientation is a idea that provide opportunity to express necessary properties of object without providing much details of the implementation of these properties.
It can be easily defined as: The database must not have any unmatched foreign key values. The term "unmatched foreign key value" means a foreign key value for which there doe
What is a view? Make a view of EMP table named DEPT 20, to display the employees in department 20 and their annual salary. Ans: View is a virtual table that does not consist
Database systems have many opposite efforts ?
About Attribute inheritance
Explain the Cartesian product: The Cartesian product operation does not need relations to union-compatible. The meaning of this is that the involved relations may have dissim
(a) Why did SAP introduce the extended star schema?
What are the advantages of creating a table from existing table?
notes about update opreation
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.
explain the steps for reduction of er model into relational model?
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