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What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
You are working for the ABC Telecom and are given some customer records for data mining. You are asked to discover, from the data, patterns that characterize low-, medium- and high
what problems are raised by the database? why is it so controversial? why is data quality an issue?
#questiononsider the following relation: CAR_SALE =(CAR_ID,oPTION_TYPE, Option_listpreice, Sale_date, Option_discountedprice)..
Text Processing: Use readLines to read SOU.txt into R. Create a vector called Pres containing the names of the presidents giving each speech. To do this, rst identify the lin
Compare the Nested-loop join and block-nested loop join Ans: Nested loop join - It is costly as worst case cost, no. of block accesses needed is n r * b s + b r where b
Define physical image of a global relation at a site
Describe the term- State Diagram State Diagram: An object could receive a sequence of the input instructions. The state of the object can differ depending upon sequence of in
In an E-R diagram an entity set is represent by? In an E-R digram entity set is represted by rectangle.
what is cascading? what is rollback cascading? please explain in detail
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