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Suppose that we have a relation schema R(A, B, C) representing a relationship between two entity sets with keys A and B, respectively and suppose that R has the FD: A $\rightarrow$ B, then the relationship in relational model possible is __________ .

A. One to many                                                                       B. One to one

C. Many to one                                                                        D. Many to many

asked in Databases by Loyal (9.2k points)
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1 Answer

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Best answer
Here A->B is the FD

so we are identifying B with A so A must be unique but B need not be

It can be like this

A        B

a         1

b          1

Here 1 is mapped to a,b of A which are unique by which 1 can be identifies so it is a many to one
answered by Boss (10.7k points)
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 if another key also mentioned than it will be one to one 

key B--->A

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