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Questions and Answers
What happens when a foreign key refers to a non-existent tuple in the related relation?
What happens when a foreign key refers to a non-existent tuple in the related relation?
Which integrity constraint is at risk when a foreign key does not have a corresponding entry in the referenced table?
Which integrity constraint is at risk when a foreign key does not have a corresponding entry in the referenced table?
Identifying a violation of which integrity constraint indicates that a foreign key is incorrectly set up?
Identifying a violation of which integrity constraint indicates that a foreign key is incorrectly set up?
Which of the following best describes the issue when a foreign key does not correspond to an existing record in the table it references?
Which of the following best describes the issue when a foreign key does not correspond to an existing record in the table it references?
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Violations of which constraint could result from inserting a record with a foreign key that does not exist in the referenced table?
Violations of which constraint could result from inserting a record with a foreign key that does not exist in the referenced table?
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Study Notes
Referential Integrity
- A foreign key constraint ensures that the values in a foreign key column match the values in the primary key of the referenced table.
- When a foreign key references a tuple (row) that does not exist in the related table, referential integrity is violated.
- Referential integrity prevents data inconsistencies and ensures data relationships are maintained.
- This constraint is essential for maintaining data integrity and ensuring data accuracy.
- Without referential integrity, data inconsistencies can occur, leading to errors and unreliable data.
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Description
This quiz explores the concept of referential integrity in databases, focusing on the importance of foreign key constraints. You'll learn how these constraints maintain data consistency and accuracy by ensuring relationships between tables remain intact. Understanding referential integrity is crucial for preventing data errors and inconsistencies.
