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Define the Boyce-Codd Normal Form with instance and also Compare BCNF and 3NF.
Ans: BCNF: For each functional dependency X->Y in a set F of functional dependencies over relation R, either:
3NF: For each functional dependency X->Y in a set F of functional dependencies over relation R, either:
a. there is no subset of a key is a key
What is OLAP? OnLine Analytical Processing (OLAP) is a Business Intelligence (BI) reporting system. OLAP gives the user with the capability to sum, count, average and do other
limitations and benefits in database tecknowlagy
Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level
What is a hashing function? What are the properties of a good hashing function? Describe the folding technique for hashing functions. Ans: Hashing function is a method
What is a homogeneous distributed database? In homogeneous distributed databases, all sites have the same database management system software, are aware of one another, and agr
Using the questions found at the end of Chapter 9 in your textbook, complete this homework activity. Students will submit a Word document answering questions 2, 3, and 4.
Give the two reasons for allowing concurrency
1. Staff (staffID --> availabilityID) 2. Services (servicesID --> itemBasedID --> timedBasedID) 3. TimedBased (timedbasedID--> priceid) 4. Clients (clientId, serviceId-->
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 are partial, alternate,, artificial, compound and natural key? Partial Key: It is a set of attributes that can uniquely recognize weak entities and that are related to s
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