Referential Integrity Basics Quiz

  • 12th Grade
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| Questions: 15 | Updated: May 2, 2026
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1. What is referential integrity in a relational database?

Explanation

Referential integrity is a fundamental concept in relational databases that ensures the consistency and validity of data. It mandates that any foreign key in a table must correspond to an existing primary key in another table, thereby maintaining relationships between tables and preventing orphaned records. This rule helps preserve data integrity across the database.

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About This Quiz
Referential Integrity Basics Quiz - Quiz

Test your understanding of referential integrity and data relationships with the Referential Integrity Basics Quiz. This assessment covers foreign keys, primary keys, database constraints, and how databases maintain data consistency across related tables. Learn why referential integrity is essential for preventing orphaned records and ensuring accurate data relationships in relational... see moredatabases. see less

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2. Which constraint prevents a foreign key from referencing a non-existent primary key?

Explanation

A FOREIGN KEY constraint is designed to maintain referential integrity between tables. It ensures that a value in one table must match an existing value in another table's primary key, preventing orphaned records and enforcing valid relationships between related data. This constraint is crucial for maintaining the integrity of database relationships.

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3. What is an orphaned record?

Explanation

An orphaned record occurs when a child record in a database still exists but its associated parent record has been deleted. This creates a situation where the child record no longer has a valid reference, leading to potential data integrity issues and complications in database relationships.

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4. In a Students and Courses table relationship, which table typically contains the foreign key?

Explanation

In a typical Students and Courses relationship, the Students table contains the foreign key that references the Courses table. This design allows each student to be associated with a specific course, establishing a one-to-many relationship where multiple students can enroll in the same course.

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5. What does CASCADE deletion do when referential integrity is enforced?

Explanation

CASCADE deletion ensures that when a parent record is deleted from a database, all related child records are automatically removed as well. This maintains referential integrity by preventing orphaned records, which could lead to inconsistencies in the data. It streamlines data management by ensuring that all related entries are synchronized during deletions.

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6. A primary key is a field that ____.

Explanation

A primary key is a crucial element in a database that ensures each record is unique. It prevents duplicate entries and maintains data integrity by providing a distinct identifier for each row, allowing for efficient data retrieval and management. This unique identification is essential for establishing relationships between tables in relational databases.

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7. True or False: A table can have multiple primary keys.

Explanation

A table can only have one primary key, which uniquely identifies each record within that table. While a primary key can consist of multiple columns (composite key), the table itself cannot have more than one primary key constraint, ensuring data integrity and preventing duplicate entries.

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8. Which action is most likely to violate referential integrity?

Explanation

Inserting a foreign key value that doesn't exist in the parent table violates referential integrity because it creates a link to a non-existent record. Referential integrity ensures that relationships between tables remain consistent, meaning every foreign key must correspond to an existing primary key in the related table.

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9. What is the SET NULL action in referential integrity?

Explanation

SET NULL action in referential integrity ensures that when a parent record is deleted, the corresponding foreign key in the child record is set to NULL. This maintains the integrity of the database by preventing orphaned records while allowing the child records to remain in the database without a valid reference to the deleted parent.

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10. A foreign key must reference a ____.

Explanation

A foreign key establishes a relationship between two tables by referencing a primary key in another table. This ensures data integrity, as it guarantees that the value in the foreign key column corresponds to an existing record in the referenced table, thereby enforcing referential integrity within the database.

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11. True or False: Referential integrity allows a foreign key to contain NULL values.

Explanation

Referential integrity ensures that relationships between tables remain consistent. A foreign key can reference a primary key in another table, but it can also be NULL, indicating that the relationship is optional. This flexibility allows for valid entries in the database where a record may not necessarily relate to another.

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12. Which of the following best describes data consistency in referential integrity?

Explanation

Data consistency in referential integrity ensures that relationships between tables remain valid. This means that if one record references another, the referenced record must exist, preventing orphaned records and maintaining the integrity of the database. It guarantees that all related data is accurate and logically connected.

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13. What happens under RESTRICT action when you try to delete a parent record with child records?

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14. A relationship between tables is established through ____.

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15. True or False: Referential integrity can only be enforced at the application level, not at the database level.

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What is referential integrity in a relational database?
Which constraint prevents a foreign key from referencing a...
What is an orphaned record?
In a Students and Courses table relationship, which table typically...
What does CASCADE deletion do when referential integrity is enforced?
A primary key is a field that ____.
True or False: A table can have multiple primary keys.
Which action is most likely to violate referential integrity?
What is the SET NULL action in referential integrity?
A foreign key must reference a ____.
True or False: Referential integrity allows a foreign key to contain...
Which of the following best describes data consistency in referential...
What happens under RESTRICT action when you try to delete a parent...
A relationship between tables is established through ____.
True or False: Referential integrity can only be enforced at the...
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