FC0-U71 Data and Database Fundamentals Practice Question
In a relational database, which constraint ensures that a foreign key value matches an existing primary key value in the referenced table?
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
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Foreign key constraint
Referential integrity is enforced by foreign key constraints, ensuring that relationships between tables remain consistent.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Foreign key constraint
Why this is correct
Correct; foreign key enforces referential integrity.
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Primary key constraint
Why it's wrong here
Primary key constraint ensures entity integrity, not referential.
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Check constraint
Why it's wrong here
Check constraint validates data based on a condition, not referential integrity.
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Unique constraint
Why it's wrong here
Unique constraint ensures no duplicates, not referential integrity.
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