Mark True/False for functional dependencies of the following table R(A, B, C, D, E), where we...
Mark True/False for functional dependencies of the following table R(A, B, C, D, E), where we assume that it is the intent of the designer that exactly this set of rows should list in the table.
|
A |
B |
C |
D |
E |
|
a1 |
b1 |
c1 |
d1 |
e1 |
|
a2 |
b2 |
c2 |
d2 |
e2 |
|
a1 |
b1 |
c1 |
d1 |
e2 |
|
a2 |
b2 |
c3 |
d4 |
e2 |
(a) A --> B (b) B --> A (c) C--> A (d) D --> A (e) CD --> B
Homework Answers
(a) A --> B
Correct Answer: True
Explanation:
For every record in the given table, the value of attribute 'B' is functionally dependent upon the value of attribute 'A'.
(b) B --> A
Correct Answer: True
Explanation:
For every record in the given table, the value of attribute 'A' is functionally dependent upon the value of attribute 'B'.
(c) C--> A
Correct Answer: True
Explanation:
For every record in the given table, the value of attribute 'A' is functionally dependent upon the value of attribute 'C'.
(d) D --> A
Correct Answer: True
Explanation:
For every record in the given table, the value of attribute 'A' is functionally dependent upon the value of attribute 'D'.
(e) CD --> B
Correct Answer: True
Explanation:
For every record in the given table, the value of attribute 'B' is functionally dependent upon the value of attribute 'CD'.
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