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In a relational database, what is the purpose of a foreign key?
In a relational database, what is the purpose of a foreign key?
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Practice Questions
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In a relational database, what is the purpose of a foreign key?
To uniquely identify a record
To establish a relationship between two tables
To enforce data integrity
To improve query performance
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A foreign key is used to establish a relationship between two tables, linking records in one table to records in another.
Questions & Step-by-step Solutions
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Q
Q: In a relational database, what is the purpose of a foreign key?
Solution:
A foreign key is used to establish a relationship between two tables, linking records in one table to records in another.
Steps: 5
Show Steps
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.
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