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Which one of the following cannot be taken as a primary key?

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in Database Management by (119k points)
Which one of the following cannot be taken as a primary key?

(a) Id

(b) Register number

(c) Dept_id

(d) Street

This question was addressed to me during an interview for a job.

Asked question is from Keys in section The Relational Model of Database Management

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Best answer
The correct choice is (d) Street

Explanation: Street is the only attribute which can occur more than once.

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