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What is the use of Union and intersection operation?
Union: The result of this operation contains all tuples that are either in r1 or in r2 or in both r1 and r2.Duplicate tuples are automatically eliminated. Intersection: The result of this relation contains all tuples that are in both r1 and r2.
) Define a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a picto
Define page. The database is partitioned into some number of fixed-length blocks, which are referred to as pages.
Atomicity: It describes a transaction to be a one unit of processing. We can also say either a transaction will be finished completely or not at all. In the transaction example 1
What is Alternate Key Alternate Key: This is the candidate key which is not taken as the primary key of the table. They are named so because although not the primary key, the
What is horizontal fragmentation? Horizontal fragmentation divides the relation by assuming every tuple of r to one or more fragments
System Design: An Object Oriented Approach Any software systems always try to change and evolve as technology and business rules evolve. The development of information systems
Which is a legal expression in SQL? SELECT NAME FROM EMPLOYEE is a legal expression in SQL.
Explain the cartesian product in Database Management System
Order by clause By using this rows can be sorted It is used in the last portion of select statement By default it gets ascending order DESC: is used
Explain how the associations are implemented as classes. A general approach in this case is to transform an association class into a simple class linked to two original classes
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