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Which one of the following cannot be taken as a primary key?Question 4Answera.Streetb.Dept_idc.Register numberd.Id

Question

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

Question 4

Answer:

  1. a. Street
  2. b. Dept_id
  3. c. Register number
  4. d. Id
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Solution

The option that cannot be taken as a primary key is "Street".

A primary key is a unique identifier for a database record. Each table in a database has a column or two specifically for the primary key.

  1. "Street" cannot be a primary key because it is not unique. Multiple people can live on the same street, so it would not uniquely identify a record.

  2. "Dept_id" could be a primary key if it is unique to each department.

  3. "Register number" could also be a primary key if it is unique to each student or employee.

  4. "Id" is often used as a primary key because it can be unique for each record.

So, the answer is "Street".

This problem has been solved

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