Consider the relational schema R(A, B, C, D), and the dependencies AB C, BD, C...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
Consider the relational schema R(A, B, C, D), and the dependencies AB → C, BD, C → A, and D→ A. (a) (3p.) Is the relation in BCNF? If not, prove this by counting the closures, and then use the decomposition algorithm until all the relations are in BCNF. Document each step and prove that the decomposed relations are in BCNF. (b) (2p.) What functional dependencies hold in the new relations? (c) (1p.) List for each relation which attributes form the minimal key. 9. (4p.) Consider the relational schema R(A, B, C, D, E, F) with functional dependencies AE → CF, B→ F, C → B, CDE → A, and F→ DE. Prove that the relation is not in BCNF and use the decomposition algorithm to break it to relations that are in BCNF. Document all the steps and reason why the resulting relations are in BCNF. Consider the relational schema R(A, B, C, D), and the dependencies AB → C, BD, C → A, and D→ A. (a) (3p.) Is the relation in BCNF? If not, prove this by counting the closures, and then use the decomposition algorithm until all the relations are in BCNF. Document each step and prove that the decomposed relations are in BCNF. (b) (2p.) What functional dependencies hold in the new relations? (c) (1p.) List for each relation which attributes form the minimal key. 9. (4p.) Consider the relational schema R(A, B, C, D, E, F) with functional dependencies AE → CF, B→ F, C → B, CDE → A, and F→ DE. Prove that the relation is not in BCNF and use the decomposition algorithm to break it to relations that are in BCNF. Document all the steps and reason why the resulting relations are in BCNF.
Expert Answer:
Answer rating: 100% (QA)
Solution Given Schema RABCDEF Set of functional dependencies B D AB C AB E AB F AC F ACE D AEF B AEF ... View the full answer
Related Book For
Fundamentals Of Database Systems
ISBN: 9780133970777
7th Edition
Authors: Ramez Elmasri, Shamkant Navathe
Posted Date:
Students also viewed these programming questions
-
Why is commercial liability insurance often arranged in layers? What are the advantages and the disadvantages? 2. What is the difference between a following form policy and stand-alone excess...
-
Consider the relational schema R = ABC. Assume that F = {C->B, BC->A, A->BC}. a. Find the cover of F: (i.e., the set of all non-trivial functional dependencies in F+ with a single attribute on the...
-
Find each limit in Problems 3760. Note that LHpitals rule does not apply to every problem, and some problems will require more than one application of LHpitals rule. lim x 3 x + 3xx - 3 X x + 6x + 9
-
Equipment was purchased on January 2, 2019, for $24,000, but no portion of the cost has been charged to depreciation. The company wishes to use the straight-line method for these assets, which have...
-
For good internal control, which of the following duties can be performed by the same individual? 1. Approve purchase orders 2. Negotiate terms with suppliers 3. Reconcile the organizations bank...
-
The data in Table 19.5 originate from the 1991 edition of the Historical Loss Development Study, published by the Reinsurance Association of American. These data have been widely used to illustrate...
-
Metallica Can Opener Company is a subsidiary of Maltz Appliances, Inc. The can opener that Metallica produces is in strong demand. Sales this year are expected to be 1,000,000 units. Full plant...
-
Question: Christian Volhard works as a financial analyst for Tooele Company, which operates a large chain of fast-food restaurants. One of the key costs of the fast-food restaurants is the cost of...
-
1. Are the four intrinsic characteristics the best ones to base the relationship performance measures for Donnell Truong Ventures? If not, what characteristics would be more suitable? In either case,...
-
Men tend to build social networks with many relationships, but very few deep relationships women tend to build social networks with a small number of very strong relationships. What are likely...
-
_____________ are exchanges of messages about a topic using email and other professional electronic tools to encourage participation that will ideally lead to new ideas, strategic planning, and sound...
-
A(n) _____________ provides a picture of who you are as an employee by highlighting your skill set.
-
Discuss strengths and weaknesses in Bard's and Frederick's estimates of the proportion of hugs Mina will give to each of them. May one of the ways of analysing fit better in one context, and the...
-
_____________ is the study of time as communication and/or as a communication function.
-
___________ refers to how people use their voices to communicate and express themselves.
-
A flood destroyed a company's warehouse contents on September 12. The following information was the only information that was salvaged: 1. Inventory, beginning: $28,600. 2. Purchases for the period:...
-
The words without recourse on an indorsement means the indorser is: a. not liable for any problems associated with the instrument. b. not liable if the instrument is dishonored. c. liable personally...
-
In what way are big data and cloud technology complementary to one another?
-
Discuss the concept of RDDs (resilient distributed datasets).
-
Discuss the two-phase commit protocol used for transaction management in a DDBMS. List its limitations and explain how they are overcome using the three-phase commit protocol.
-
A particle is accelerated such that its position as a function of time is given by \(\vec{x}=b t^{3} \hat{t}\), with \(b=1.0 \mathrm{~m} / \mathrm{s}^{3}\). What is the particle's acceleration as a...
-
Figure P3.76 shows graphs of the \(x\) component of acceleration as a function of time for two different carts rolling along a flat horizontal table. In which case is the change in the \(x\)...
-
A particle moves in the \(x\) direction according to the equation \(x(t)=b t^{3}+c t^{2}+d\), where \(b=4.0 \mathrm{~m} / \mathrm{s}^{3}\), \(c=-10 \mathrm{~m} / \mathrm{s}^{2}\), and \(d=20...
Study smarter with the SolutionInn App