Question 9796 – Digital-Logic-Design
December 11, 2023Question 8711 – ER-Model
December 11, 2023Question 8703 – ER-Model
A prime attribute of a relation scheme is an attribute that appears
Correct Answer: B
Question 13 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.
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 .
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