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How nulls are treated in comparison operator?
Along with comparison (relational) operators, the null values are ignored as we cannot derive the relation along with the given operand. Nulls cannot be equated. Nulls can be checked through containment by using IS NULL or IS NOT NULL operators.
What is De-normalization? De-normalization is the method of attempting to optimize the performance of a database by adding redundant data. It is sometimes essential because cur
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How nulls are treated in comparison operator? Along with comparison (relational) operators, the null values are ignored as we cannot derive the relation along with the given op
Replicating Data One approach that may support efficient access to dissimilar applications as above may be to give access to every of the applications from dissimilar replicate
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Objectives After reading this unit you should be able to: Explain storage of databases on hard disks; Discuss the execution of various file Organisation techniques;
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