Functional dependency terminology: in the dependency R → S, is R properly called the determinant?

Introduction / Context:
Functional dependencies (FDs) describe how attribute sets constrain each other. The left-hand side (LHS) of an FD determines the values on the right-hand side (RHS). This question checks your recall of the standard term for the LHS.

Given Data / Assumptions:

• FD written as R → S, where R and S are sets of attributes.
• By definition, R functionally determines S.
• Minimality is not assumed unless specifically stated (e.g., candidate keys).

Concept / Approach:
The LHS of an FD is called the determinant because its values uniquely determine the RHS within a given relation state. Whether R is minimal (i.e., no proper subset determines S) is a separate property; minimal determinants correspond to candidate keys when RHS includes all attributes in the relation.

Step-by-Step Solution:

Verification / Alternative check:
Consult normalization steps (e.g., 3NF) where determinants play a role in identifying transitive dependencies.

Why Other Options Are Wrong:

• “Incorrect” contradicts accepted terminology.
• Conditions about keys or minimality are unnecessary to name the determinant.

Common Pitfalls:
Confusing “determinant” with “candidate key.” A candidate key is a minimal determinant of all attributes in the relation.

Final Answer:
Correct