Which of the following statements is false ?
A prime attribute can be transitively dependent on a key in BCNF relation.
Any two-attribute relation is in BCNF, and if every key has a single attribute, no partial dependency is possible, so the relation is in 2NF.
3NF allows \(X \rightarrow A\) when A is prime, so a prime attribute may be transitively dependent on a key in 3NF.
BCNF requires every determinant to be a superkey, which rules out any transitive dependency, even for prime attributes, so the last statement is false.
Hence, A prime attribute can be transitively dependent on a key in BCNF relation.
Similar Questions
Which of the following is false ?
The Relation
Vendor Order (V_no, V_ord_no, V_name, Qty_sup, unit_price)
is in 2NF because :
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
Consider the following relational schemas for a library database :
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 ?
In a schema R(A, B, C, D, E, F, G, H), each field of R contains only atomic values.
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 ?
Which of the following/s is/are FALSE statement?
A. An all key relation is always in BCNF since it has no FDs.
B. A relation that is not in 4NF due to nontrivial MVD must be decomposed to convert it into a set of relations in 4NF.
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
The relation R is in _______.
Important Questions from Normal Form
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}.
The relation team is decomposed into two relations, t1(name, city) and t2(name, owner). Which of the following statement(s) is/are TRUE?
In a relational database, which one of the following is CORRECT:
Which of the following is false ?
