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Explain the Weak Entity Set An Entity set which does not have sufficient attribute to make a primay key is known as weak entity set. For instance, dependents of an employee in
Deletion Anomalies: Loss of important Information: In some cases, useful information may be lost when a tuple is deleted. For instance, if we delete the tuple corresponding to stu
E-R Model This data model is based on real world that consists of basic objects named entities and of relationship among these objects. Entities are illustrated in a database
how oracle can be used
ERD Diagram of Medical Recruitment Agency?
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
Benefits and limitations
Describe multi key files
What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.
Lossless-Join Decomposition Let us show an intuitive decomposition of a relation. We require a better basis for deciding decompositions since intuition may not always be r
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