Homework Answers
Solution:-
Correct option - All of the above
Since by the clousre of CE , clousre of AC , clousre of CF , clousre of AF you can generate the schema constituting (A,B,C,E,F) so all of them are valid and the given functional dependencies are valid and all are followed from F.
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Consider the set of FDs F = {CF-A, AF-CF, AC-F, EF-D, C-EF, D-B, AE–F}. Which of...
Question 9 Not yet answered Marked out of 2.00 P Flag question Consider the set of...
Question 9 Not yet answered Marked out of 2.00 P Flag question Consider the set of FDs F = {CF-A, AF-CF, AC-F, EF-D, C-EF, D4B, AE--F}. Which of the following FDs does not follow from F? (2 Põints) Select one: CE-B AC-B CF-B AFGB All of the above None of the above
Let R(A,B,C,D) be a relation with FDs F = {A—B, AC, C-A, B,C, ABC-D} Which of...
Let R(A,B,C,D) be a relation with FDs F = {A—B, AC, C-A, B,C, ABC-D} Which of the following statements is correct ? (2 points) Select one: G = {A-B, B-C, C-A, AC=D } is a canonical cover of F H = { AC, CA, BC,BD} is a canonical cover of F. o F is a canonical cover of itself. O G and H are canonical covers of F. None of the above.
Let R(A,B,C,D,E) be a relation with FDs F = {AB-C, CD-E, E-B, CE-A} Consider an instance...
Let R(A,B,C,D,E) be a relation with FDs F = {AB-C, CD-E, E-B, CE-A} Consider an instance of this relation that only contains the tuple (1, 1, 2, 2, 3). Which of the following tuples can be inserted into this relation without violating the FD's? (2 points) Select one: O (0, 1, 2, 4,3) (1,1,2,2,4) (1.2.2, 2, 3) o (1,1,3,2,3) All of the above can be inserted. None of the above can be inserted.
Let R(A,B,C,D) be a relation with FDs F = {A-B, A-C, C-A, B-C, ABC—D} Which of...
Let R(A,B,C,D) be a relation with FDs F = {A-B, A-C, C-A, B-C, ABC—D} Which of the following statements is correct ? (2 Points) Select one: G= {A-B, B-C, C-A, AC-D } is a canonical cover of F O H = {A-C, C-A,B,C,B-D) is a canonical cover of F. o F is a canonical cover of itself. G and Hare canonical covers of F. None of the above.
Let R(A, B, C, D) be a relation with FDs F= {A->B, A->C, C->A, B->C, ABC->D}...
Let R(A, B, C, D) be a relation with FDs F= {A->B, A->C,
C->A, B->C, ABC->D} which of the statement is correct?
Question 2 Not yet answered Marked out of 2.00 P Flag question Let R(A,B,C,D) be a relation with FDs F = {AL-B, AC, CA, B-C, ABC-D} Which of the following statements is correct ? (2 Points) Select one: O G = {A--B, BC, C-A, AC-D} is a canonical cover of F OH = {A-C, C+A, B-C, B-D} is...
Let R(A, B, C, D, E) be a relation wit FDs F = {AB->C, CD->E, E->B,...
Let R(A, B, C, D, E) be a relation wit FDs F = {AB->C,
CD->E, E->B, CE->A}....
Question 4 Not yet answered Marked out of 2.00 P Flag question Let R(A,B,C,D,E) be a relation with FDs F = {AB-C, CD-E, E-B, CE-A} Consider an instance of this relation that only contains the tuple (1, 1, 2, 2, 3). Which of the following tuples can be inserted into this relation without violating the FD's? (2 points) Select one: 0 (0, 1,...
4. (4 points) Consider the relation RCA, B, C, D, E) with the set of FDs:...
4. (4 points) Consider the relation RCA, B, C, D, E) with the set of FDs: F ABE, CD-E 4-+ C, C-+?). Decompose R into BCNF. Write and explain all steps in your decomposition.
A committee of 2 people is to be selected from 6 executives, Alam, Bartolini, Chinn, Dickson, Elsberg, and Francis. Write out the sample space S, choosing an S with equally likely outcomes, if po...
A committee of 2 people is to be selected from 6 executives, Alam, Bartolini, Chinn, Dickson, Elsberg, and Francis. Write out the sample space S, choosing an S with equally likely outcomes, if possible. Then give the value of n(S) and tell whether the outcomes in S are equally likely. Finally, write the indicated events below in set notation. a. Ellsberg is on the committee. b. Alam and Bartolini are not both on the committee. c. Both Bartolini and Chinn...
This question is from the subject: Database Systems QUESTION 8 Consider the relation R(A,B,C,D,E,F) with FDs...
This question is from the
subject: Database Systems
QUESTION 8 Consider the relation R(A,B,C,D,E,F) with FDs A -> C,B->D, C-> E, D -> F. Consider the BCNF status of R. Which of the following could be correct given the information above? 1. Ris in BCNF already. 2. Ris not in BCNF. It must be divided into R1(A,C,E) with FDs A->C, C-> E, and R2(B,D,F) with FDs B -> D, D -> F. 3. R is not in BCNF. It must...
For the following relations and set of FDs: 1. give a key for the relation; 2....
For the following relations and set of FDs: 1. give a key for the relation; 2. state whether the relation is in BCNF, and if it is not state why: 3. give a set of relations in 3NF equivalent to the original relation 1. (33 points) What is the closure of (A,B) with respect to R(A,B,C,D,E,F,G)if R has the following functional dependencies? (a) GCDE AF BF - ABC FC G (b) D-AC-D A+B ABC 2 33 points for each of...
Question 9 Not yet answered Marked out of 2.00 P Flag question Consider the set of FDs F = {CF-A, AF-CF, AC-F, EF-D, C-EF, D4B, AE--F}. Which of the following FDs does not follow from F? (2 Põints) Select one: CE-B AC-B CF-B AFGB All of the above None of the above
Let R(A,B,C,D) be a relation with FDs F = {A—B, AC, C-A, B,C, ABC-D} Which of the following statements is correct ? (2 points) Select one: G = {A-B, B-C, C-A, AC=D } is a canonical cover of F H = { AC, CA, BC,BD} is a canonical cover of F. o F is a canonical cover of itself. O G and H are canonical covers of F. None of the above.
Let R(A,B,C,D,E) be a relation with FDs F = {AB-C, CD-E, E-B, CE-A} Consider an instance of this relation that only contains the tuple (1, 1, 2, 2, 3). Which of the following tuples can be inserted into this relation without violating the FD's? (2 points) Select one: O (0, 1, 2, 4,3) (1,1,2,2,4) (1.2.2, 2, 3) o (1,1,3,2,3) All of the above can be inserted. None of the above can be inserted.
Let R(A,B,C,D) be a relation with FDs F = {A-B, A-C, C-A, B-C, ABC—D} Which of the following statements is correct ? (2 Points) Select one: G= {A-B, B-C, C-A, AC-D } is a canonical cover of F O H = {A-C, C-A,B,C,B-D) is a canonical cover of F. o F is a canonical cover of itself. G and Hare canonical covers of F. None of the above.
Let R(A, B, C, D) be a relation with FDs F= {A->B, A->C,
C->A, B->C, ABC->D} which of the statement is correct?
Question 2 Not yet answered Marked out of 2.00 P Flag question Let R(A,B,C,D) be a relation with FDs F = {AL-B, AC, CA, B-C, ABC-D} Which of the following statements is correct ? (2 Points) Select one: O G = {A--B, BC, C-A, AC-D} is a canonical cover of F OH = {A-C, C+A, B-C, B-D} is...
Let R(A, B, C, D, E) be a relation wit FDs F = {AB->C,
CD->E, E->B, CE->A}....
Question 4 Not yet answered Marked out of 2.00 P Flag question Let R(A,B,C,D,E) be a relation with FDs F = {AB-C, CD-E, E-B, CE-A} Consider an instance of this relation that only contains the tuple (1, 1, 2, 2, 3). Which of the following tuples can be inserted into this relation without violating the FD's? (2 points) Select one: 0 (0, 1,...
4. (4 points) Consider the relation RCA, B, C, D, E) with the set of FDs: F ABE, CD-E 4-+ C, C-+?). Decompose R into BCNF. Write and explain all steps in your decomposition.
A committee of 2 people is to be selected from 6 executives, Alam, Bartolini, Chinn, Dickson, Elsberg, and Francis. Write out the sample space S, choosing an S with equally likely outcomes, if possible. Then give the value of n(S) and tell whether the outcomes in S are equally likely. Finally, write the indicated events below in set notation. a. Ellsberg is on the committee. b. Alam and Bartolini are not both on the committee. c. Both Bartolini and Chinn...
This question is from the
subject: Database Systems
QUESTION 8 Consider the relation R(A,B,C,D,E,F) with FDs A -> C,B->D, C-> E, D -> F. Consider the BCNF status of R. Which of the following could be correct given the information above? 1. Ris in BCNF already. 2. Ris not in BCNF. It must be divided into R1(A,C,E) with FDs A->C, C-> E, and R2(B,D,F) with FDs B -> D, D -> F. 3. R is not in BCNF. It must...
For the following relations and set of FDs: 1. give a key for the relation; 2. state whether the relation is in BCNF, and if it is not state why: 3. give a set of relations in 3NF equivalent to the original relation 1. (33 points) What is the closure of (A,B) with respect to R(A,B,C,D,E,F,G)if R has the following functional dependencies? (a) GCDE AF BF - ABC FC G (b) D-AC-D A+B ABC 2 33 points for each of...
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