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:
- a. Street
- b. Dept_id
- c. Register number
- d. Id
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.
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"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.
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"Dept_id" could be a primary key if it is unique to each department.
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"Register number" could also be a primary key if it is unique to each student or employee.
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"Id" is often used as a primary key because it can be unique for each record.
So, the answer is "Street".
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