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In a relational database, what is the purpose of a foreign key?

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Question: In a relational database, what is the purpose of a foreign key?

Options:

  1. To uniquely identify a record
  2. To establish a relationship between two tables
  3. To enforce data integrity
  4. To improve query performance

Correct Answer: To establish a relationship between two tables

Solution: 

A foreign key is used to establish a relationship between two tables, linking records in one table to records in another.

In a relational database, what is the purpose of a foreign key?

Practice Questions

Q1
In a relational database, what is the purpose of a foreign key?
  1. To uniquely identify a record
  2. To establish a relationship between two tables
  3. To enforce data integrity
  4. To improve query performance

Questions & Step-by-Step Solutions

In a relational database, what is the purpose of a foreign key?
  • Step 1: Understand that a relational database stores data in tables.
  • Step 2: Know that each table can have a unique identifier called a primary key.
  • Step 3: A foreign key is a field in one table that links to the primary key of another table.
  • Step 4: This link creates a relationship between the two tables.
  • Step 5: The purpose of the foreign key is to ensure data integrity and to allow for easy retrieval of related data.
  • Foreign Key – A foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table, establishing a link between the two tables.
  • Relationships in Databases – Foreign keys are essential for defining relationships between tables, such as one-to-many or many-to-many relationships.
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