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What is the purpose of a foreign key in a relational database?

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Question: What is the purpose of a foreign key in a relational database?

Options:

  1. To uniquely identify a record
  2. To create a relationship between two tables
  3. To enforce data integrity
  4. All of the above

Correct Answer: All of the above

Solution: 

A foreign key serves to create a relationship between two tables and enforce data integrity by ensuring that the value in one table corresponds to a valid record in another.

What is the purpose of a foreign key in a relational database?

Practice Questions

Q1
What is the purpose of a foreign key in a relational database?
  1. To uniquely identify a record
  2. To create a relationship between two tables
  3. To enforce data integrity
  4. All of the above

Questions & Step-by-Step Solutions

What is the purpose of a foreign key in a relational database?
  • Step 1: Understand that a relational database consists of multiple tables that can be related to each other.
  • Step 2: Know that a foreign key is a special column in one table that links to the primary key of another table.
  • Step 3: Realize that the primary key is a unique identifier for records in its own table.
  • Step 4: Learn that the foreign key ensures that the value in the foreign key column matches a value in the primary key column of the other table.
  • Step 5: Understand that this relationship helps maintain data integrity, meaning it prevents invalid data from being entered.
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