Homework Answers
Answer:
Every relation that is in 3NF have no redundancy.
Explanation: 3NF which is a very strict normal form, removes all the redundant data virtually.
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Which of the following statements is CORRECT? (1 Point) Select one: Every relation that is in...
Which of the following statements is CORRECT? (1 Point) Select one: O Every relation that is...
Which of the following statements is CORRECT? (1 Point) Select one: O Every relation that is in 3NF have no redundancy. A relation that is in BCNF could have some redundancy. Every relation that is in 3NF is also in BCNF. For Every relation that is not in BCNF, we can always find a lossless-join and dependency-preserving decomposition of the relation into BCNF relations. All of the above. O None of the above
Which of the following statements is CORRECT? (1 Point) Select one: O Every relation that is...
Which of the following statements is CORRECT? (1 Point) Select one: O Every relation that is in 3NF have no redundancy. O A relation that is in BCNF could have some redundancy. o Every relation that is in 3NF is also in BCNF. For Every relation that is not in BCNF, we can always find a lossless-join and dependency-preserving decomposition of the relation into BCNF relations All of the above. None of the above
First, come up with a relation with some functional dependencies. At least one of the functional...
First, come up with a relation with some functional dependencies. At least one of the functional dependencies violates BCNF and at least one other of the functional dependencies makes it not dependency-preserving. Now, do lossless-join decomposition into BCNF although it may not be dependency-preserving. Second, come up with a relation with some functional dependencies that make it dependency-preserving but not lossless-join. Explain every step.
my choices for these are wrong. 10 points QUESTION 3 Given R=(A, B, C) is a...
my choices for these are wrong.
10 points QUESTION 3 Given R=(A, B, C) is a schema and F = {2C-A AB) is a set of FDs that hold on R. Which of the following statements is not true? d=(AB. AC) is a decomposition of that is in BCNF. O Ris in 3NF O BC is a candidate key for R Ris in BCN 10 points QUESTION 4 Given R= (A. 3. CD. E) is a schema and F= (A...
Databases question Consider the following relation that stores information about students living in dormitories at a...
Databases question
Consider the following relation that stores information about
students living in dormitories at a college:
a. Using these assumptions and stating any others you need to
make, list all the non-trivial functional dependencies for this
relation
b. What are the candidate keys for this relation? Identify the
primary keys
c. Is this relation in third normal form? if not find a 3NF
lossless join decomposition of College that preserves
dependencies.
d.Is the relation or the resulting set of...
For the relation R(O,P,X,Y,E, S) FDs={ O->P, XY->O, OE->S, EY->X, PY->X}. 1.Classi...
for the relation R(O,P,X,Y,E, S) FDs={ O->P, XY->O, OE->S, EY->X, PY->X}. 1.Classify each functional dependency 2. Decompose the relation into BCNF relation. 3. Determine whether each of the decompositions has the lossless join property with respect to F and conclude for the whole decomposition. 4. Determine whether each of the decompositions has the dependency preserving property with respect to FD and conclude for the whole decomposition
Language: SQL - Normalization and Functional Dependencies Part 4 Normalization and Functional Dependencies Consider the following relation R(A, B, C, D)and functional dependencies F that hold o...
Language: SQL - Normalization and Functional
Dependencies
Part 4 Normalization and Functional Dependencies Consider the following relation R(A, B, C, D)and functional dependencies F that hold over this relation. F=D → C, A B,A-C Question 4.1 (3 Points) Determine all candidate keys of R Question 4.2 (4 Points) Compute the attribute cover of X-(C, B) according to F Question 43 (5 Points) Compute the canonical cover of F.Show each step of the generation according to the algorithm shown in class....
Answer the following questions: Consider the relation schema R = (N. Y, P. M. and assume...
Answer the following questions: Consider the relation schema R = (N. Y, P. M. and assume that the following set of functional dependencies holds on R: The letters can be interpreted as follows: R=(Model_Number. Year, Price, Manufacturing Plant Color). 1. [25 points] Give a lossless.join decomposition of Rinto Boyce-Codd normal form. Make sure to use the algorithm studied in class (Figure 7.11, page 331 of the book) and to show all details. 2. [25 points] Does your decomposition preserve functional dependencies? Justify your...
Normalisation Consider the following relation schema about project meetings: PMG(projID, title, type, manager, jobID, start-date, end-date,...
Normalisation Consider the following relation schema about project meetings: PMG(projID, title, type, manager, jobID, start-date, end-date, contractor, contractNo) Some notes on the semantics of attributes are as follows: • Each project has a unique project ID (projID) and also has a title, type and manager. Each manager has a specialty project type. • A project often contracts jobs to contractors with start-date and end-date. Contracts are identified by contract numbers (contractNo), but contract details are out of the scope of...
(1 point) Select all statements that are correct. There may be more than one correct answer....
(1 point) Select all statements that are correct. There may be more than one correct answer. The statements may appear in what seems to be a random order. A. Euler's method is generally a very accurate method for approximating solution curves to differential equations B. Halving the step size in Euler's method approximately halves the error. C. Euler's method is a numerical method for approximating points lying on a solution curve to a differential equation. D. Euler's method does not...
Which of the following statements is CORRECT? (1 Point) Select one: O Every relation that is in 3NF have no redundancy. A relation that is in BCNF could have some redundancy. Every relation that is in 3NF is also in BCNF. For Every relation that is not in BCNF, we can always find a lossless-join and dependency-preserving decomposition of the relation into BCNF relations. All of the above. O None of the above
Which of the following statements is CORRECT? (1 Point) Select one: O Every relation that is in 3NF have no redundancy. O A relation that is in BCNF could have some redundancy. o Every relation that is in 3NF is also in BCNF. For Every relation that is not in BCNF, we can always find a lossless-join and dependency-preserving decomposition of the relation into BCNF relations All of the above. None of the above
my choices for these are wrong.
10 points QUESTION 3 Given R=(A, B, C) is a schema and F = {2C-A AB) is a set of FDs that hold on R. Which of the following statements is not true? d=(AB. AC) is a decomposition of that is in BCNF. O Ris in 3NF O BC is a candidate key for R Ris in BCN 10 points QUESTION 4 Given R= (A. 3. CD. E) is a schema and F= (A...
Databases question
Consider the following relation that stores information about
students living in dormitories at a college:
a. Using these assumptions and stating any others you need to
make, list all the non-trivial functional dependencies for this
relation
b. What are the candidate keys for this relation? Identify the
primary keys
c. Is this relation in third normal form? if not find a 3NF
lossless join decomposition of College that preserves
dependencies.
d.Is the relation or the resulting set of...
Language: SQL - Normalization and Functional
Dependencies
Part 4 Normalization and Functional Dependencies Consider the following relation R(A, B, C, D)and functional dependencies F that hold over this relation. F=D → C, A B,A-C Question 4.1 (3 Points) Determine all candidate keys of R Question 4.2 (4 Points) Compute the attribute cover of X-(C, B) according to F Question 43 (5 Points) Compute the canonical cover of F.Show each step of the generation according to the algorithm shown in class....
Answer the following questions: Consider the relation schema R = (N. Y, P. M. and assume that the following set of functional dependencies holds on R: The letters can be interpreted as follows: R=(Model_Number. Year, Price, Manufacturing Plant Color). 1. [25 points] Give a lossless.join decomposition of Rinto Boyce-Codd normal form. Make sure to use the algorithm studied in class (Figure 7.11, page 331 of the book) and to show all details. 2. [25 points] Does your decomposition preserve functional dependencies? Justify your...
(1 point) Select all statements that are correct. There may be more than one correct answer. The statements may appear in what seems to be a random order. A. Euler's method is generally a very accurate method for approximating solution curves to differential equations B. Halving the step size in Euler's method approximately halves the error. C. Euler's method is a numerical method for approximating points lying on a solution curve to a differential equation. D. Euler's method does not...
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