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A prime attribute of a relation scheme R is an attribute that appears , A prime attribute of a relation scheme R is an attribute that appears
A prime attribute of a relation scheme R is an attribute that appears
A.
in all candidate keys of R.
in all candidate keys of R.
B.
in some candidate key of R.
in some candidate key of R.
C.
in a foreign keys of R.
in a foreign keys of R.
D.
only in the primary key of R.
only in the primary key of R.
Solution
B. in some candidate key of R.
Explanation
A prime attribute or key attribute of a relation scheme R is an attribute that appears in any of the candidate key of R, remaining attributes are known as non-prime or non-key tribute.
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