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Explain how you can define an object model of a system.
A list of terms that shall be used by end users to describe state and behaviour of objects in system.
Different user classes may need different mental models of objects in the system. This concludes:
Which type of objects there are (user objects).
What information user can know about object of a particular type (user object attributes).
How objects may be related to the other objects (relationships).
Object types with 'subtypes' that have additional specialised actions or attributes i.e., User object, User object subtype, User object action, Container objects.
A model of business objects which end users believe interact within a GUI system.
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
Representing complex relationship among data A database may contain varieties of data interrelated to each other in numerous ways. A DBMS must have the capability to represent
Explain query execution plan? - Optimizer available in SQL Server optimizes code to be effectively executed. - A query execution plan demonstrates how this optimizer would r
i want to database for online assignment submission system
Define the concept of generalization A generalization is relationship between specific kind of thing and general thing. It is also known as "is-a-kind-of" relationship. Inher
Describe the nested-loop join and block-nested loop join. Ans: The block nested- loop join algorithm is as described below: for every block B r of relation R do beg
SELECT Statement This statement is used for retrieving information from the databases. It can be coupled with many clauses. Let us talk about these clauses in more detail:
write program
What are the Constituents of File? Also elaborates all the possible file operations? A file is organised logically as sequence of record. These records are mapped onto disk blo
average response time?
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