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What are axioms? Axioms or rules of inference give a simpler technique for reasoning about
Define entity integrity and referential integrity. How does SQL allow specification of these? Ans: Entity Integrity Rule- If the attribute A of relation R is a prime attribut
Define data model? A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.
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 im
Write a query that display ename annual salary and comm from emp table
What are the advantages of creating a table from existing table?
Give the general form of SQL query? Select A1, A2............., An From R1, R2..............., Rm Where P
explain various steps uses in evaluation and maintenance of MIS.
What is a view? How it is related to data independence? A view might be thought of as a virtual table, that is, a table that does not really exist in its own right but is inste
Define the Attribute Inheritance The attributes of a higher level entity set are inherited through a lower level entity set made by specialization-generalization hierarchy. Nam
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