FC0-U71 Data and Database Fundamentals Practice Question
In a relational database, a foreign key in the 'Enrollments' table references the primary key of the 'Students' table. What does this relationship primarily enforce?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Referential integrity
Foreign keys enforce referential integrity, ensuring that values in the foreign key column match a primary key value in the referenced table.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Referential integrity
Why this is correct
Foreign keys maintain referential integrity between tables.
- ✗
Entity integrity
Why it's wrong here
Entity integrity is enforced by primary keys, not foreign keys.
- ✗
Normalization
Why it's wrong here
Normalization reduces redundancy, not directly enforced by foreign keys.
- ✗
Domain integrity
Why it's wrong here
Domain integrity is about allowed values for a column.
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Same concept, more angles
1 more way this is tested on FC0-U71
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. In a relational database, which constraint ensures that a foreign key value matches an existing primary key value in the referenced table?
medium- ✓ A.Foreign key constraint
- B.Primary key constraint
- C.Check constraint
- D.Unique constraint
Why A: Referential integrity is enforced by foreign key constraints, ensuring that relationships between tables remain consistent.
JA
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