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What is a foreign key?

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Question: What is a foreign key?

Options:

  1. A primary key in another table
  2. A unique identifier for a table
  3. An attribute that can be null
  4. A key used for indexing

Correct Answer: A primary key in another table

Solution: 

A foreign key is a primary key in another table that establishes a relationship between the two tables.

What is a foreign key?

Practice Questions

Q1
What is a foreign key?
  1. A primary key in another table
  2. A unique identifier for a table
  3. An attribute that can be null
  4. A key used for indexing

Questions & Step-by-Step Solutions

What is a foreign key?
Correct Answer: A foreign key is a primary key in another table.
  • Step 1: Understand that a database is made up of tables that store information.
  • Step 2: Each table can have a special column called a primary key that uniquely identifies each row in that table.
  • Step 3: A foreign key is a column in one table that links to the primary key of another table.
  • Step 4: This link creates a relationship between the two tables, allowing you to connect 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 or the same table.
  • Relationship Between Tables – Foreign keys are used to establish and enforce a link between the data in two tables.
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