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A Functional dependency is described by X Y between two groups of attributes Y and X that are subsets of R specifies a constraint on the possible tuple that can make a relation state r of R. The constraint is for any two tuples t2 and t1 in r if t1[X] = t2[X] then they have t1[Y] = t2[Y]. This seems the value of X element of a tuple uniquely calculates the value of element Y.
what are the main characteristics of database
Describe Parameteric end users? Parametric end users might be given update access, but are commonly not permitted to change the structure of data.
what are the reasons having variable length records
Illustrate the term- Abstracting Out Common Behaviour Inheritance is not every time recognised during analysis phase of development, thus it is necessary to re-evaluate object
Design a gennalization and specialization hierarchy for an automobile sales company
Drawbacks of Database systems ?
Association as a cache This association must be updated when any new element is added to it, but testing for overlap using association is more efficient. Figure:
What is meant by normalization of data? It is a process of examining the given relation schemas based on their Functional Dependencies (FDs) and primary key to achieve the prop
Why did SAP introduce the extended star schema? Explain why it is reported to be better than the traditional schema model?
What is DML Query Langauge? Data Manipulation Language (DML) - A data manipulation language is a language in which enables users to access or manipulate data as organized throu
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