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Define an operator that a Relational Algebra does not have
Ans: Relational Algebra does not have Aggregation operators.
What is primary Key Explain? Primary Key - Primary key is one of the candidate keys. It should be selected such in which its attribute values are never, or very rarely, chang
What is recursive closure? Why is it not possible to describe this operation in relational algebra? Recursive closure is applied to recursive relationship. An instance of rec
what is Lossless-join decomposition
Define Fifth Normal form is concerned with Ans : Fifth Normal form is concerned with Join dependency.
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
State the Component Diagram A component diagram represents a set of component and relationships among them. In a dynamic model, component diagram is used to model physical com
What is candidate key? Candidate Key - A candidate key of an entity set is a minimal superkey, which uniquely identifies each row in the relation.
What is foreign key? Foreign Key - Let there are two relations in tables R and S. Any candidate key of the relation R that is referred in the relation S is known as the forei
What are referential integrity constraints? A value that appears in single relation for a given set of attributes also appears for a particular set of attributes in another rel
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
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