Database - The Relational Model and Normalization - Discussion
Discussion Forum : The Relational Model and Normalization - General Questions (Q.No. 1)
1.
Every time attribute A appears, it is matched with the same value of attribute B, but not the same value of attribute C. Therefore, it is true that:
Discussion:
23 comments Page 1 of 3.
Harsha said:
6 years ago
Because A is functional to B is less than or greater than to it.
Elias joseph said:
8 years ago
Answer is A because in a change of a implies that also b change.
Shahin said:
8 years ago
@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.
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.
(2)
Sefu julius said:
9 years ago
The correct answer is A->B.
Emil said:
9 years ago
Is A-->B is same as B-->A. A matches with B, so is it true that B matches with A?
Harsh Dusane said:
10 years ago
Because here A functionally determines B but not C so A->B.
Padmasri said:
10 years ago
Because A can uniquely identifies B each time.
As per the rule A->B means if A is true then B is true.
As per the rule A->B means if A is true then B is true.
Arshad said:
10 years ago
A is functionally dependent on B.
RAHUL KUMAR said:
10 years ago
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.
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.
Kash said:
1 decade ago
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. !
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