Question 9796 – Digital-Logic-Design
December 11, 2023ER-Model
December 11, 2023ER-Model
| Question 8 |
A prime attribute of a relation scheme is an attribute that appears
| in all candidate keys of R. | |
| in some candidate key of R. | |
| in a foreign key of R. | |
| only in the primary key of R . |
Question 8 Explanation:
A prime attribute of a relation scheme R is an attribute that appears in some candidate keys of R. Need not to appear in all the candidate keys.
Ex: AB, BC, CD are candidate keys of R(ABCD). In the FDs set one attribute may not be part of all the FDs.
Ex: AB, BC, CD are candidate keys of R(ABCD). In the FDs set one attribute may not be part of all the FDs.
Correct Answer: B
Question 8 Explanation:
A prime attribute of a relation scheme R is an attribute that appears in some candidate keys of R. Need not to appear in all the candidate keys.
Ex: AB, BC, CD are candidate keys of R(ABCD). In the FDs set one attribute may not be part of all the FDs.
Ex: AB, BC, CD are candidate keys of R(ABCD). In the FDs set one attribute may not be part of all the FDs.
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