### Discussion :: The Relational Model and Normalization - General Questions (Q.No.1)

Abhishek Tamrakar said: (Mar 2, 2011) | |

Beacause only value of A will match with B. So A->B is true. |

Aani said: (Apr 15, 2011) | |

Because of logical signs properties. |

Shrav said: (Jul 5, 2011) | |

A can uniquely identifies B each time so A->B |

Honey said: (Oct 3, 2011) | |

What is it's meaning---- A->B..? |

Runa said: (Feb 3, 2012) | |

A->B means the occurence of A attribute with B eyery time. |

Chandra said: (Mar 1, 2012) | |

A->B every attribute in A should match with B. |

Ouen said: (Mar 27, 2012) | |

Value of B depends on value of A; i.e. A is uniquely determined B |

Khalid Seid said: (Feb 7, 2013) | |

Value of B depends on value of A. i.e A is the determinant but B is the dependent. |

Nivikpr said: (Jul 31, 2013) | |

As per the rule A->B means if A is true then B is true. |

Vishnu said: (Oct 20, 2013) | |

The functional dependency A->B states that the set of values present in A are also in the B so that's why it matches the values in the case of A and B but not with C. |

Richa Chaurasia said: (Apr 2, 2014) | |

Because of every attribute of A will also match with B but not C. And then value of A $ B will depend to each other. A->B. |

Rahul said: (Apr 26, 2014) | |

A -> B means that, each value of A determines exactly one value of B. And B is functionally dependent on A. |

Shivakavya said: (Nov 12, 2014) | |

Because A can uniquely identifies B each time. So A->B. Option A. |

Kash said: (Dec 12, 2014) | |

It is a general thing to be noticed that if A will be related to both B & C, then how can the value not be same to C. So option A is correct. ! |

Rahul Kumar said: (Mar 31, 2015) | |

According to question A->B. That means A would have all the contents such as that of B. So instead of using tends to operation. Here have to use the UNION operation (A U B). And guys please look forward for this. |

Arshad said: (Jul 8, 2015) | |

A is functionally dependent on B. |

Padmasri said: (Jul 9, 2015) | |

Because A can uniquely identifies B each time. As per the rule A->B means if A is true then B is true. |

Harsh Dusane said: (Sep 3, 2015) | |

Because here A functionally determines B but not C so A->B. |

Emil said: (Dec 12, 2015) | |

Is A-->B is same as B-->A. A matches with B, so is it true that B matches with A? |

Sefu Julius said: (Jul 5, 2016) | |

The correct answer is A->B. |

Shahin said: (Feb 28, 2017) | |

@Emil. If A -> B holds then it's not necessary the B -> A also hold true. A B ---------------------------- b 5 b 5 c 5 For every occurrence of b in A there is value 5 in B hence A -> B. But for every Value of B which is 5 is not same value in A (b,c two values in A). Hence If A -> B holds then it's not necessary that B -> A also holds true. |

Elias Joseph said: (Jul 3, 2017) | |

Answer is A because in a change of a implies that also b change. |

Harsha said: (Jun 20, 2019) | |

Because A is functional to B is less than or greater than to it. |

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