117. functional dependency — example 4

DBMS Published 30 Sept 2026 Updated 30 Sept 2026 0 Views Verified

What does X -> Y mean?

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Answer & Explanation

4 Answers

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Option A

X must always be a foreign key.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

Y must always be a primary key.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option C

For a relation, the value of X functionally determines the value of Y: equal X values imply equal Y values.

Additional Explanation

Correct implementation. Prefer parameterized queries in application code, validate affected rows for UPDATE/DELETE, and use transactions for related writes.

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Option D

X and Y must be numeric.

Additional Explanation

This option is incorrect for the stated requirement.