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Previous Year Question (PYQs)

An organization needs to maintain database having five attributes $A,B,C,D,E$. These attributes are functionally dependent on each other for which functional dependency set $F$ is given as:

$F={A\rightarrow BC,\ D\rightarrow E,\ BC\rightarrow D,\ A\rightarrow D}$

Consider a universal relation $R(A,B,C,D,E)$ with functional dependency set $F$. Also all attributes are simple and take atomic values only.

Identify the normal form in which relation $R$ belong to.





Solution

$A$

Since the primary key contains only one attribute, there is no partial dependency.

So, relation $R$ is in $2NF$.

Now check for $3NF$.

Given dependency:

$D\rightarrow E$

Here, $D$ is not a super key and $E$ is a non-prime attribute.

So, relation is not in $3NF$.

Therefore, the highest normal form of relation $R$ is:

$2NF$


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