Functional Dependency Math Example 4
Follow the full solution, then compare it with the other examples linked below.
Example 4
mediumIn a class, is final grade a function of student name?
Solution
- 1 Each student has exactly one final grade.
- 2 Yes — student name → grade is a functional dependency (assuming unique names).
Answer
Yes (assuming unique names).
Real-world functional dependencies: employee → salary, ISBN → book title, student → GPA. The key property is that knowing the input uniquely determines the output.
About Functional Dependency
A relationship where the value of one quantity (the output or dependent variable) is completely determined by the value of another quantity (the input or independent variable). If depends on , then knowing uniquely determines .
Learn more about Functional Dependency →