Suppose that I have a relation with the following structure, where (EmployeeID, Department) is a composite...

Suppose that I have a relation with the following structure, where (EmployeeID, Department) is a composite primary key.

DEPARTMENT (EmployeeID, EmployeeName, Department, TotalSales).

Further suppose that the following functional dependencies exist

(EmployeeID, Department) → (EmployeeName, TotalSales)

EmployeeID → EmployeeName

True or False: The above relation is in 2NF.

True or False: A relation in second normal form is automatically in third normal form.

True or False: If PartNumber → PartWeight, then PartNumber will be unique in a relation.

Solutions

Expert Solution

A. The relation is in 2NF.

This is False because the relation contains partial functional dependency EmployeeID -> EmployeeName .

This is partial functional dependency since EmployeeID is primary key attribute. And partial functional dependency violates 2NF.

Therefore the given relation is not in 2NF.

B. A relation in second normal form is automatically in third normal form.

This is False.

When a relation is in 2NF, it still can contain transitive functional dependency. And transitive functional dependency violates 3NF

So the given statement is False.

When a relation is in 3NF , then it automatically is in 2NF.

C. If PartNumber → PartWeight, then PartNumber will be unique in a relation.

False.

PartNumber will be unique in a relation only if PartNumber is primary key for the relation. What if, partNumber -> partWeight is a transitive functional dependency. Then PartNumber can contain duplicate value.

If you have any questions comment down. Please just don't simply downvote and leave. If you are satisfied with answer, please? upvote. I really need it, Thanks...

venereology answered 1 week ago

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