Reference no: EM132080063
Need help with sql transaction question. Please explain how to reach the solutions for the questions below.
Perform the test for the non-additive join property (lossless join) for the relation R(A1, A2, A3, A4, A5), and the decompositions Da, Db, Dc, Dd and set of functional dependencies F given below. Ignore attributes that are not mentioned in each subsection (e.g., you can ignore absence of A4 in Dd, test the join between R1and R2):
Da = { R1(A1, A2) , R2(A3, A4, A5) }
Db = { R1(A3, A4) , R2(A4, A5) }
Dc = { R1(A1, A5) , R2(A4, A5) }
Dd = { R1(A1, A2, A3) , R2(A1, A2, A5) }
F = { A1 ->A4 , A4->A5 , A3->A4 }
Does the decomposition Da have the non-additive join property? Explain why or why not.
Does the decomposition Db have the non-additive join property? Explain why or why not.
Does the decomposition Dc have the non-additive join property? Explain why or why not.
Does the decomposition Dd have the non-additive join property? Explain why or why not.
|
Compute the amount of the stock dividend
: Tidwell Corporation issued a 4 percent stock dividend on 20,000 shares of its $10 par common stock. At th time of the dividend, the market value of the stock.
|
|
Identify candidate keys of employee
: Identify candidate keys of EMPLOYEE. Construct a decomposition of EMPLOYEE into relations in 3NF that preserves dependencies.
|
|
Write an awk script to display the phone number
: Write an awk script called activity6.1-6.awk to display the phone number of the user whose username is assigned to the variable user at the command line.
|
|
Determine how to maximize your cash on hand
: At time 0, you have $10,000. Investments A and B are available; their cash flows are shown in the table below: Assume that any money not invested.
|
|
Perform the test for the non-additive join property
: Perform the test for the non-additive join property (lossless join) for the relation R(A1, A2, A3, A4, A5), and the decompositions Da, Db, Dc, Dd .
|
|
Emobile technology into healthcare organization
: Other considerations of implementing eMobile technology into a healthcare organization?
|
|
What is the concept utilitarianism according to jeremy
: What is the concept utilitarianism according to Jeremy Bentham? Is this a morally valid approach to governance? Why or why not?
|
|
What is the total cost that should be assigned to the job
: Copy Center pays an average wage of s12 per hour to employees for printing and copying jobs, and allocates s18 of overhead for each employee hour are assoned.
|
|
Print all teamids where the team played against th database
: Although not shown in this instance, New York is home to the Mets in the National league as well as the Yankees in the American league .
|