Question: What is a foreign key in a relational database?
Options:
A key that uniquely identifies a record
A key that links two tables together
A key that is used for indexing
A key that is automatically generated
Correct Answer: A key that links two tables together
Solution:
A foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table.
What is a foreign key in a relational database?
Practice Questions
Q1
What is a foreign key in a relational database?
A key that uniquely identifies a record
A key that links two tables together
A key that is used for indexing
A key that is automatically generated
Questions & Step-by-Step Solutions
What is a foreign key in a relational database?
Correct Answer: A foreign key is a field in one table that links to a primary key in another table.
Step 1: Understand that a relational database is a way to organize data in tables.
Step 2: Each table has rows and columns, where rows are individual records and columns are the attributes of those records.
Step 3: A foreign key is a special type of column in one table.
Step 4: This foreign key points to a primary key in another table.
Step 5: The primary key is a unique identifier for each row in its own table.
Step 6: By using a foreign key, we can link data between two tables.
Step 7: This helps maintain relationships and ensures data integrity in the database.
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 relationship between the two tables.
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