DatabaseManagementSystem
October 14, 2023DatabaseManagementSystem
October 14, 2023DatabaseManagementSystem
Question 14

For a database relation R(a,b,c,d), where the domains a, b, c, d include only atomic values, only the following functional dependencies and those that can be inferred from them hold:
a → c b → d
This relation is
in first normal form but not in second normal form


in second normal form but not in third normal form


in third normal form


None of the above

Question 14 Explanation:
Candidate key is ab.
Since all a, b, c, d are atomic. So the relation is in 1NF.
Checking the FD’s
a → c
b → d
We can see that there is partial dependencies. So it is not 2NF.
So answer is option (A).
Since all a, b, c, d are atomic. So the relation is in 1NF.
Checking the FD’s
a → c
b → d
We can see that there is partial dependencies. So it is not 2NF.
So answer is option (A).
Correct Answer: A
Question 14 Explanation:
Candidate key is ab.
Since all a, b, c, d are atomic. So the relation is in 1NF.
Checking the FD’s
a → c
b → d
We can see that there is partial dependencies. So it is not 2NF.
So answer is option (A).
Since all a, b, c, d are atomic. So the relation is in 1NF.
Checking the FD’s
a → c
b → d
We can see that there is partial dependencies. So it is not 2NF.
So answer is option (A).
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