Question: Given the set F= {A-B, AB-C, ACBD} of functional dependencies, prove the following dependencies by using the Armstrong axioms. (1) A-ABC (2) AD-BCD 2. Consider

Given the set F= {A-B, AB-C, AC—BD} of functional dependencies, prove the following dependencies by using the Armstrong axioms.

(1) A-ABC (2) AD-BCD

2. Consider a relation schema R(X, Y, Z) with the functional dependencies XYZ and Z-X. Can we conclude that Y-XZ holds? If yes, please argue why. If no, please argue why not by giving a counterexample.

3.Consider the relation schema R(A, B, C, D, E, F) and the set of functional dependencies F = {A-B, A-C, CD-E, CD—F, B-E}. Infer at least five new FDs by using five different Armstrong's axioms and derived inference rules. (Please do not include the trivial ones such as A-A in your answer.) Show each step.

4. Assume we have a set F = {A-B, C-D} of functional dependencies for a relation schema R(A, B, C, D). Write down all the functional dependencies of the closure F of F and count them.

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

lets go through these step by step Given the set F AB ABC ACBD of functional dependencies prove the ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!

(a) A single layer perceptron neural network is used to classify the 3 input logical gate NOR shown in figure Q4. Using as a learning rate of 0.1, train the neural network for the first 3 epochs. use...

A marketing organization wishes to study the effects of four sales methods on weekly sales of a product. The organization employs a randomized block design in which three salesman use each sales...

2. Using the database schema {R_1,R_2,...,R_n} and the corresponding sets F_1,F_2,...,F_n of FDs obtained from question (1.ii): (i) Using the definition of 3NF, explain whether each R_i is in 3NF or...

V History Bookmarks Window Help Absg-online.com Simulation Quiz 2 1: Assume a company's Income Statement for Year 12 is as follows: Income Statement Data Net Revenues from Footwear Sales Cost of...

1. Consider the following instance: A B C D 4 2 5 2 5 8 4 4 3 3 3 4 1 2 5 3 6 4 6 1 - Does the functional dependency D->C hold in this instance? - Does the functional dependency C->B hold in this...

Consider a relation R with seven attributes ABCDEF. You are given the following dependencies: a) AB C b) C A c) BC D d) D E e) D F f) BE C g) CF B h) CE F 6. Using Armstrong Axioms prove that the...

Portray in words what transforms you would have to make to your execution to some degree (a) to accomplish this and remark on the benefits and detriments of this thought.You are approached to compose...

The following exercises concern the relational schema R = ABCDEG and instance r of this schema depicted in Table 1 below. ABCDEG a1 b1 c1 d1 e1 g1 a2 b2 c1 d2 e2 g2 a2 b2 c1 d2 e2 g3 a3 b3 c3 d2 e3...

The population of a town increases each year by 5% of its total at the beginning of each year. If the population on 1 January 2015 was 40000. What will it be on 1 January 2017? 1. 44900 48400 3....

Sickle cell anemia is: Caused by mutations in either the alpha-globin gene or the beta-globin gene. An autosomal dominant disease. An X-linked recessive disease. Always caused by the same point...

Determine whether each of the following statements is true or false. If it is true, explain your reasoning. If it is false, give a counterexample. (a) If 6 is a multiple of a number, then 12 is also...

On December 31, 2015, Emmanuel Company had 99,000 shares of common stock issued and outstanding. Emmanuel issued a 9% stock dividend on June 30, 2016. On October 1, 2016, 24,000 shares of common...

The shareholders' equity of Janeek Enterprises includes $291,900 of no par common stock and $560,800 of 6% noncumulative preferred stock. The board of directors declared cash dividends of $90,500 in...

Any type of issue, whether it is substantive or emotional, play the role of development in organization. Do you agree or disagree with the statement? Justify your answer with examples.

6. The circle touches the sides BC, CA and AB of respectively at D, E and F. If the lengths BD, CE and AF are consecutive integers then the largest side of the triangle is equal to a) 13 b) 14 c) 15...

Complete the sentences with a preposition (in, at, or on) or (-) no preposition. a. What did you do _____ last night? b. I got up late _____ yesterday. c. I relax _____ the weekend. d. We went to...

Which of the following is not true about multichannel shopping?Group of answer choicesShowrooming is a type of multichannel shopping.Webrooming occurs when shoppers inspect a product in a physical...

What is search relevance? How is it determined?

Draw a state diagram and discuss the typical states that a transaction goes through during execution.

Repeat Exercises 10.7 and 10.9, but use JDBC with Java as the host language. Exercise 10.7 Consider the database shown in Figure 1.2, whose schema is shown in Figure 2.1. Write a program segment to...

11.44. A recent article6 used multiple regression to predict attitudes toward homosexuality. The researchers found thatthe effect ofnumber ofyears of education on a measure of tolerance toward...

11.38. In about 200 words, explain to someone who has never studied statistics what multiple regression does and how it can be useful.

11.33. Refer to the student data file you created in Exercise 1.12. For variables chosen by yourinstructor, fit a multiple regression model and conduct descriptive and inferential statistical...