The Relation Vendor Order (V_no, V_ord_no, V_name, Qty_sup, unit_price) is in 2NF because :
Non_key attribute V_name is dependent on V_no which is part of composite key
Here the composite key is (V_no, V_ord_no), while V_name, Qty_sup and unit_price are non-key attributes.
V_name depends only on V_no, which is a part of the composite key; this is a partial dependency, and it is exactly the property that decides the 2NF status of this relation.
Qty_sup and unit_price are not key attributes, and V_name does not depend on Qty_sup, so the other three statements describe dependencies that do not exist.
The relevant reason is therefore the dependency of V_name on V_no alone.
Hence, Non_key attribute V_name is dependent on V_no which is part of composite key.
Similar Questions
Which of the following is false ?
Select the ‘False’ statement from the following statements about Normal Forms :
Consider the schema
R = {S, T, U, V}
and the dependencies
S → T, T → U, U → V and V → S
If R = (\(R_{1}\) and \(R_{2}\)) be a decomposition such that \(R_{1} \cap R_{2} = \phi\) then the decomposition is
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Book (Title, Author, Catalog_no, Publisher, Year, Price)
Collection(Title, Author, Catalog_no)
with the following functional dependencies :
I. Title, Author → Catalog_no
II. Catalog_no → Title, Author, Publisher, Year
III. Publisher, Title, Year → Price
Assume (Author, Title) is the key for both schemas. Which one of the following is true ?
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F = {CH→G, A→BC, B→CFH, E→A, F→EG} is a set of functional dependencies so that F+ is exactly the set of FDs that holds R. The relation R is :
Which of the following relations can not be decomposed in to BCNF with a lossless join and dependency-preserving decomposition ?
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A. An all key relation is always in BCNF since it has no FDs.
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C. The decomposition removes the redundancy by the MVD.
D. 3NF is stronger than BCNF.
Choose the correct answer from the options given below:
Fifth normal form is concerned with :
For a database relation R(A, B, C, D) where the domains of A, B, C and D include only atomic values, only the following functional dependencies and those that can be inferred from them are :
A → C
B → D
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Which of the following statement(s) is/are correct regarding a relation in second normal form?
I. It is in first normal form
II. Every non-key attribute is fully and functionally independent on the primary key
Which of the following normal forms specifically addresses and eliminates partial dependencies?
Consider a relational schema team(name, city, owner), with functional dependencies {name $\to$ city, name $\to$ owner}.
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In a relational database, which one of the following is CORRECT:
Which of the following is false ?
