InterviewSolution
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InterviewSolution
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i)Whichofthefollowingcannot be used to uniquely identify a tuple in a relation?a) Super key (b) Primary key (c) Candidate key (d) Foreign key |
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Answer» A superkey is a set of attributes within a table whose values can be used to uniquely identify a tuple.A candidate key is a minimal set of attributes necessary to identify a tuple; this is also called a minimal superkeyA primary key is a field in a table which uniquely identifies each record/tuple in a database table. Therefore, foreign key can not be used to uniquely identify tuple in a relation. (d) is correct option |
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