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SQL Transactions Exercises
For the universal relation R(w,x,y,z), consider the decomposition D consisting of R1(w,y,z) and R2(x,y), and the set F of functional dependencies { y->xz ; yz->w ; x->w }.
Recall that the projection of set of functional dependences G on relation Rx consists of every functional dependency in (G)+ that contains only attributes from Rx.
a. Compute the projection of F on R1.
b. Compute the projection of F on R2.
c. Does the decomposition D preserve the set of dependencies F? Why or why not?
Explain whether the following sets closed under following operations? Justify your answer. If a set is not closed under operation, what is its closure under the operation.
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Perform the given subtraction using 1's compliment and 2's compliment.
Several social networks like Facebook or LinkedIn are able to accurately recommend people you may want to become friends with or connect to.
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one of the main functions of any business is to be able to use data to leverage a strategic competitive advantage. this
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The download rate of each peer is 4,000 bits/sec. What is the minimum time required to distribute the file to all the peers under the peer-to-peer model ?
Devise a 7-bit even-parity Hamming code for the digits 0 to 9.
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