Let a relation R (ABCD) and functional dependency FD’s {A → B, B → C}
In a function dependency, how many attribute/attributes possible on left-hand side.
Now we calculate each attribute closer and functional dependency:
1. Where we exclude A, B, and C and calculate FD for attribute ɸ
So, the number FD for attribute ɸ is 1.
2. Only A
Again at RHS, we get three options to make FDs.
Total number of FDs possbile
Question:
A relation R(A, B) and Functional Dependencies F = {A → B, B → A}. How many Functional Dependencies are possible?
Solution:
Relation R(A, B) and given F ={A → B, B → A}
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