Question
Which functional dependency holds in given relation R (A, B,
- C and why?
Read the below passage and answer the questions Functional dependency A B means that B is dependent on A
i.e. from the value of A we can find the value of B from the relation. Therefore, to prove A B holds in a relation, one of the following conditions must be true: Condition1: either all the value of A must be unique Or Condition2: all the value of B must be same Or Condition3: If two or more tuples/rows of the relation have same value for attribute A then there must be also same value for attribute B
i.e. if t1[A] = t2[A] then there must be t1[B] = t2[B].
i.e. from the value of A we can find the value of B from the relation. Therefore, to prove A B holds in a relation, one of the following conditions must be true: Condition1: either all the value of A must be unique Or Condition2: all the value of B must be same Or Condition3: If two or more tuples/rows of the relation have same value for attribute A then there must be also same value for attribute B
i.e. if t1[A] = t2[A] then there must be t1[B] = t2[B].
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