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Explain the ISA relationship
Answer: ISA relationship - ISA notation is employed in generalization/ specialization to depict relationship among lower and higer level entity set.
A student entity type has the following attributes,name..
For each m:n relationship type R, we make a new table (say S) to represent R. We also contain the primary key attributes of both the participating entity types as a foreign key att
What is Distributed system ? Distributed System - A distributed system consists of a number of processing parts in which are interconnected through a computer network and in
Define object-relational systems? Systems that give object-oriented extensions to relational systems are known as object-relational systems.
it can be possible to create any table without primary key
Design a gennalization and specialization hierarchy for an automobile sales company
Modular growth: In distributed environments, it is simple to expand. Latest sites can be added to the network without affecting the operations of other sites, as they are somewhat
What is a function group? A function group is a collection of logically related modules that share global data with every other. All the modules in the group are contained in
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
Although how will the system recover The selection of REDO or UNDO for a transaction for the recovery is completed on the basis of the state of the transactions. This state is
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