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Describe Specialsation and generalization?
Specialisation /generalization: This is a top down and bottom up approach to the design of database. It displays the IS_A relationship among a super class (parent) and related sub-classes. It is represented through inverted triangle in the Chen notation.
It defines that no primary key value can be null. This is as the primary key is used to recognize individual tuple in the relation. So we will not be able to recognize the records
State the definition of association An association is a structural relationship which specifies that objects of one thing are connected with objects of another. In UML, asso
Briefly describe concurrency execution? Lock - based protocols Locks There are several modes in which a data item may be locked in this section we restrict our attention
Write short notes on extension and intension? In any data model, it is significant to distinguish among the description of the database and the database itself the description
#A multinational tour operator agency has gained new business growth in the North American market through the use of social media. Its operation has expanded by 50% within six mont
growing phase and shrinking phase are disjoint, why ?
What are the typical phases of query processing
Database Administrator One of the main perpose for having the database management system is to have control of both data or programs accessing that data. The person having li
What is Relational calculus? Relational calculus is a Non- Procedural language.
What is difference between TRUNCATE and DELETE? - Truncate can't be rolled back whereas Delete can be. - Truncate keeps the lock on table whereas Delete keeps the lock on ea
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