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Explain retrieval in QBE? Retrieval in QBE : A "GUI" for expressing queries. Based on the Domain Relational Calculus (DRC) Actually invented before GUIs. Very co
How to reduce data redundency
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
How does a query tree represent a relational algebra expression? Ans: This includes transforming an initial expression (tree) into an equivalent expression (tree) that is
Normal 0 false false false EN-IN X-NONE X-NONE
Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level
Provide Examples of different types of Time and Date formats. It's most common store dates using a dash (-) as a colon (:)and the delimiter as the time delimiter. The given fo
What do you mean by Correlated subquery? Subqueries, or nested queries, are used to bring back a set of rows to be used by the parent query. Depending on how the subquery is writ
Question 1: (a) Explain the legal meaning of :- (i) Computer Service Person (ii) Data holding (b) Explain how the law ensures Data protection and Security. Qu
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