Question: Consider the schema R (A, B, C, D, E) and let the following set F of functional dependencies hold for R: F-A BC, CD E,C

Consider the schema R (A, B, C, D, E) and let

Consider the schema R (A, B, C, D, E) and let the following set F of functional dependencies hold for R: F-A BC, CD E,C A, B D Problem 1 Prove or disprove AD E is in the closure of F. A proof can be made by using inference rules IR1 through IR3. A disproof should be done by showing a relational instance (counter example) that refutes the rule

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

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!

Consider the schema R - (A, B, C, D, E) and let the following set F of functional dependencies hold for R: F-\A-> BC, CD E,C A, B- D Problem 4 Give a lossless, dependency-preserving decomposition...

Consider the schema R = (A, B. C, D, E) and let the following set F of functional dependencies Problem 5 Give a lossless decomposition into BCNF of schema R

Consider the schema R = (A, B, C, D, E) and let the following set F of functional dependencies holdforR: F = {A -> BC, CD -> E,C -> A, B -> D} Q: Suppose that the schema R = (A, B, C, D, E) is...

Problem 1.[100 points total. Each has 20 points.] Consider the schema R (A, B, C, D, E, F) and the following set F of functional dependencies holds on R: A BCD BC DE B D DA a. Compute A+ b. Prove...

Will rate! Problem 1.[100 points total. Each has 20 points.] Consider the schema R (A, B, C, D, E, F) and the following set F of functional dependencies holds on R A BCD BC DE DA a. Compute A+ b....

Consider the schema R = ( A, B, C, D, E ) and let the following set F of functional dependencies holdfor R : F = {A -> BC, CD -> E, C -> A, B -> D,} 1) Prove or disprove AD E is in the closure of F....

Consider the schema R- (A, B, C, D, E and let the following set F of functional dependencies hold for R: F-A-)BC. CD-)E, C A, B D } Problem 2 What are the candidate keys of R = (A, B, C, D, E)?...

Problem 1.[100 points total. Each has 20 points.] Consider the schema R (A, B, C, D, E, F) and the following set F of functional dependencies holds on R: ABCD BC DE BD D-A Compute A*. Prove that the...

Consider the schema R = (A, B, C, D, E, G) and the set F of functional dependencies: AB CD B D DE B DEG AB AC DE R is not in BCNF for many reasons, one of which arises from the functional dependency...

Q:Question:Q4 [20 pts] Consider a relation R 1(A, B, C, D, E, F, G) and a set of functional dependencies FD={AB?E, C?D, DE?F, DA?G} which hold on R1. Using Armstrong's axioms verify if the following...

As a project manager, you are responsible for preparing project cost estimates. The three most popular estimation techniques are: Rough order of magnitude (ROM). Budgetary estimate. Definitive...

Should patients who are bleeding from the stomach get transfusions when their hemoglobin level falls below 7 grams per deciliter (restrictive strategy) or when it falls to 9 grams per deciliter...

Developers are often tasked with managing the raising of Equity to complete their capital stack for purchasing property. Which of these comments are TRUE? a ) General Partners direct the day - to -...

Compared with half a century ago, adoption has become _ _ _ _ _ _ _ _ _ common, but it is more open and acceptabl e , so we probably discuss it _ _ _ _ _ _ _ . fill in the blanks more or much less or...

6. Allow employees to take time off from work to acquire knowledge, study problems, attend training, and use technology.

1. Use technology, e-mail, and social networking sites (such as Facebook or MySpace) or portals on the company intranet that allow people to store information and share it with others.

7. Discuss the key features of the learning organization.