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What is substitutability? Any method of a class-say A can equally well be adjured with any object belonging to any subclasses B of A. This characteristic leads to code reuse, a
What is B-Tree? A B-tree eliminates the redundant storage of search-key values .It permits search key values to appear only once.
A domain is a set of permissible values that can be given to an attribute. So each attribute in a table has a definite domain. Values to these attributes cannot be assigned outside
Chapter 10a review questions
What is average response time? The average response time is that the average time for a transaction to be done after it has been submitted.
draw er diagram using entities crop,employee,department,plot,cultivation plan,machinery,seed,fertilizer
Define functional and multivalued dependencies. Ans: A functional dependency is a assets of the semantics of the attributes in a relation. The semantics point out how at
WHAT IS DATABASE TECHNOLOGIES
A super key is an attribute or set of attributes used to recognize the records uniquely in a relation. For instance, in the Relation PERSON defines earlier PERSON_ID is a super
Difference between Operating System and Database Security Security within the operating system can be executed at various levels ranging from passwords for access to system, t
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