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What is a primary key in a database?

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Question: What is a primary key in a database?

Options:

  1. A key that allows duplicate values
  2. A unique identifier for a record in a table
  3. A key used for indexing
  4. A key that can be null

Correct Answer: A unique identifier for a record in a table

Solution: 

A primary key is a unique identifier for a record in a table, ensuring that no two records can have the same primary key value.

What is a primary key in a database?

Practice Questions

Q1
What is a primary key in a database?
  1. A key that allows duplicate values
  2. A unique identifier for a record in a table
  3. A key used for indexing
  4. A key that can be null

Questions & Step-by-Step Solutions

What is a primary key in a database?
  • Primary Key – A primary key is a unique identifier for a record in a table, ensuring that no two records can have the same primary key value.
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