Functional Dependencies and Normalization · Database Management System · GATE CSE

In a relational data model, which one of the following statements is TRUE?

Consider a relation R(A, B, C, D, E) with the following three functional dependencies. AB $$\to$$ C ; BC $$\to$$ D ; C $$\to$$ E; The number of superk...

A database of research articles in a journal uses the following schema. (VOLUME, NUMBER, STARTPAGE, ENDPAGE, TITLE, YEAR, PRICE) The primary key is (V...

Consider the relation $$X\left( {P,Q,R,S,T,U} \right)$$ with the following set of functional dependencies $$\eqalign{ & F = \left\{ \, \right....

The maximum number of superkeys for the relation schema $$R(E, F, G, H)$$ with $$E$$ as key is ______.

A prime attribute of a relation scheme $$R$$ is an attribute that appears

Consider the relation schema $$R = \left( {E,\,F,\,G,\,H,\,I,\,J,\,K,L,\,M,\,N} \right)$$ and the set of functional dependencies $$\left\{ {\left\{ {E...

Which of the following is TRUE?

A table has fields, $$F1, F2, F3, F4, F5,$$ with the following functional dependencies: $$F1 \to F3.\,F2 \to F4.\,\,\,\left( {F1\,.\,F2} \right) \to ...

Which one of the following statements about normal forms is FALSE?

Relation $$R$$ with an associated set of functional dependencies, $$F,$$ is decomposed into $$BCNF.$$ The redundancy (arising out of functional depend...

Consider a schema $$R(A,B,C,D)$$ and functional dependencies $$A \to B\,\,$$ and $$C \to D\,\,$$. Then the decomposition of $$R$$ into $${R_1}\left( {...

Let $$R=(A,B,C,D,E,F)$$ be a relation scheme with the following dependencies: $$C \to F,\,E \to A,\,EC \to D,\,A \to B.$$ Which of the following is a ...

Which normal form is considered adequate for normal relational database design?

State True or False with reason. There is always a decomposition into Boyce-codd normal form $$(BCNF)$$ that is lossless and dependency preserving.

Consider the relation R(P, Q, S, T, X, Y, Z, W) with the following functional dependencies. PQ → X; P → YX; Q → Y; Y → ZW Consid...

Consider a relational table R that is in 3NF, but not in BCNF. Which one of the following statements is TRUE?

Let the set of functional dependencies F = {QR → S, R → P, S → Q} hold on a relation schema X = (PQRS). X is not in BCNF. Suppose X is decomposed into...

Consider an Entity-Relationship (ER) model in which entity sets E1 and E2 are connected by an m : n relationship R12. E1 and E3 are connected by a 1 :...

Given the following two statements: $$S1:$$ Every table with two single-valued attributes is in $$1NF, 2NF, 3NF$$ and $$BCNF.$$ $$S2:$$ $$AB \to C,\,\...

Relation $$R$$ has eight attribution $$ABCDEFGH.$$ Fields of $$R$$ contain only atomic values. $$F = \left\{ {CH \to G,\,\,A \to BC,\,B \to CFH,\,\,E ...

Relation $$R$$ has eight attribution $$ABCDEFGH.$$ Fields of $$R$$ contain only atomic values. $$F = \left\{ {CH \to G,\,\,A \to BC,\,B \to CFH,\,\,E ...

Consider the following relational schemes for a library database. Book ( Title, Author, Catalog_ no, Publisher, Year, Pr ice ) Collection ( Title, Aut...

Let $$R\left( {A,B,C,D} \right)$$ be a relational schema with the following functional dependencies: $$A \to B,\,\,B \to C,\,\,C \to D$$ and $$D \to ...

Let $$R\left( {A,\,B,\,C,\,D,E,P,G} \right)$$ be a relational schema in which the following functional dependencies are known to hold: $$AB \to CD,\,...

Which one of the following statements if FALSE?

Consider the relation enrolled (student, course) in which (student, course ) is the primary key, and the relation Paid (student, amount) where student...

The following functional dependencies are given : $$\eqalign{ & AB \to CD,\,AF \to D,\,\,DE \to F, \cr & C \to G.\,\,\,\,\,\,\,\,\,\,F \...

In a schema with attributes $$A, B, C, D,$$ and $$E,$$ following set of functional dependencies are given $$\eqalign{ & \,\,\,A \to B \cr &...

Consider a relation scheme $$R = \left( {A,\,B,\,C,\,D,\,E,\,H} \right)$$ on which the following functional dependencies hold: $$\left\{ {A \to B,\,\,...

A relation Empdt $$1$$ is defined with attributes empcode (unique), name, street, city, state and pincode. For any pincode, there is only one city and...

The relation scheme student Performance (Name, CourseNo, RollNo, Grade) has the following functional dependencies: Name, courseNo $$\,\, \to \,\,$$ gr...

Consider the following functional dependencies in a database. $$\eqalign{ & \,\,\,\,Date\,\,of\,\,Birth\,\, \to \,\,Age \cr & \,\,\,\,\,...

From the following instance of a relation schema $$R(A, B, C),$$ we can conclude that: ...

Relation $$R$$ is decomposed using a set of functional dependencies, $$F,$$ and relation $$S$$ is decomposed using another set of functional dependenc...

$$R(A,B,C,D)$$ is a relation. Which of the following does not have a lossless-join, dependency preserving $$BCNF$$ decomposition?

Given the following relation instance $$\eqalign{ & X\,\,\,\,\,Y\,\,\,\,\,Z \cr & \,\,1\,\,\,\,\,\,4\,\,\,\,\,\,2 \cr & \,\,1\,\...

Consider the schema $$R = \left( {S\,\,T\,\,U\,\,V} \right)$$ and the dependencies $$S \to T,\,\,T \to U,\,\,U \to V$$ and $$V \to S$$ let $$R =$$ $$(...

Consider the following database relations containing the attributes Book–id Subject–Category–of–book Name–of–Author Nationality–of–Author With book–id...

Consider the following database relations containing the attributes Book–id Subject–Category–of–book Name–of–Author Nationality–of–Author With book–id...

For a database relation $$R(a,b,c,d),$$ where the domains of $$a, b, c, d$$ include only atomic values, only the following functional dependencies and...

Let $$R (a, b, c)$$ and $$S(d, e, f)$$ be two relations in which $$d$$ is the foreign key of $$S$$ that refers to the primary key of $$R.$$ Consider t...

(a) Consider the relation scheme $$R(A, B, C)$$ with the following functional dependencies: $$\eqalign{ & A,B \to C \cr & \,\,\,\,\,\,C ...