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Describe Dynamic Model.
The dynamic model specifies allowable sequences of changes to the objects from an object model. It contains event trace diagrams describing scenarios. An event is the external stimulus from one object to other that occurs at a particular point of time. An event is one-way transmission of information from one object to other. A scenario is sequence of events which occurs during one particular execution of the system. Each fundamental execution of the system shall be represented as a scenario.
Differentiate between various levels of data abstraction? Data Abstraction - Abstraction is the procedure to hide the irrelevant things from the users and represent the rele
draw er diagram using entities crop,employee,department,plot,cultivation plan,machinery,seed,fertilizer
multidimensional data model
Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.
Which data manipulation command combines the records from one or more tables ? JOIN data manipulation command combines the records from one or more tables.
brief history,definition,current trends and future trends if any of data fragmentation
Write a short note on oracle Instance? Oracle Instances: An instance is the (executed) Oracle software and the memory they use. It is the instance which manipulates the data s
What function divides one numeric expression by another and returns the remainder? MOD function divides one numeric expression by another and returns the remainder.
What are the four main characteristics of the database approach? The four major characteristics of the database approach are: 1. Self-describing nature of a database system. 2.
Describe Application programming interface? Application Programming Interface - Commercial SQL implementations take one of the two primary techniques for involving SQL in a p
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