Data Base Management System | Week 1

Course Name: Data Base Management System

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These are Data Base Management System Week 1 Assignment Answers

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Q1) Which level of abstraction describes types of data that are stored in the Database?
a) Physical level
b) Logical level
c) View level
d) Abstraction level

Answer: a) Physical level

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Q2) Identify the valid primary key for the relation paper_info from the given instance.

a) paper_id
b) paper_id, corresponding Author
c) conference_id, corresponding_Author
d) paper_id, conference_id

Answer: a) paper_id

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These are Data Base Management System Week 1 Assignment Answers

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Q3) Identify the correct statement/s.
a) Project (pCode, pName) is an instance of a relation schema.
b) Project (pCode, pName) is an example of a physical schema.
c) (2245, HardFort) is an instance of a relation schema.
d) (2245, HardFort) is an example of a logical schema.

Answer: a) Project (pCode, pName) is an instance of a relation schema.

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Q4) Consider a relation Vehicle (VID, Model, Speed, Color) where the superkeys are as follows:
{VID}, {VID, Model}, {Speed, Color}, {Speed, Color, Model}.
Select the possible candidate key(s).
a) {VID}
b) {Speed}
c) {Color}
d) {Speed, Color}

Answer: a) {VID}

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These are Data Base Management System Week 1 Assignment Answers

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Q5) Consider the following relations:
Book (ISBN, Title, Pages)
BookGenre (ISBN, Genre)
What does the following relational algebra expression represent?
IIISBN((Pages>100 Book) (Genre-Fiction/BookGenre))
a) Find the ISBN of all Book with more than 100 Pages.
b) Find the ISBN of all Book with more than 100 Pages or are of Genre ‘Fiction’.
c) Find the ISBN of all Book with more than 100 Pages but are not of Genre ‘Fiction’.
d) Find the ISBN of all Book with more than 100 Pages and are of Genre ‘Fiction’.

Answer: d) Find the ISBN of all Book with more than 100 Pages and are of Genre ‘Fiction’.

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Q6) Consider the following relational schema:
ImageCode (ImageID, Name)
ImageBook (BookID, Image ID, Page)
What will be the Relational Algebra equivalent to the following statement?
“Find the names of all Images on Page 100.”
a) Name (ImageCode Page=100 (ImageBook)) X
b) Name (Ipage=100 (ImageCode) ImageBook)
c) IIName(IIpage=100 (ImageCode) ▷ ImageBook)
d) IIName (Image Code Page=100 (ImageBook))

Answer: d) IIName (Image Code Page=100 (ImageBook))

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These are Data Base Management System Week 1 Assignment Answers

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Q7) Consider the following tables:

Which of the following operations will return S1 itself?
a) S2-(S2-S1)
b) S1-(S2-S1)
c) S1-(S1-S2)
d) S2-(S1-S2)

Answer: c) S1-(S1-S2)

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Q8) Consider the following tables:

Identify the correct operation(s) which will be produce the following output from the above relations.

a) (#Faculties>=20000) (UniversitiesDetails)
b) (#Faculties>20000) (Universities Details)
c) IIStateName, #State Universities, #Faculties (#Faculties>=20000) (Universities Details)
d) IlStateName, #State Universities, #Faculties (#Faculties> 20000) (UniversitiesDetails)

Answer: c) IIStateName, #State Universities, #Faculties (#Faculties>=20000) (Universities Details)

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Q9) Consider the following tables:

Identify the correct operation(s) which will be produce the following output from the above two relations.

a) Details Details2
b) Details – Details₁
c) (Details₁ U Details ₂) n (Details₁ Details₂)
d) (Details1 Details2) U (Details2 – Details 1)

Answer: d) (Details1 Details2) U (Details2 – Details 1)

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These are Data Base Management System Week 1 Assignment Answers

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Q10) Which of the following can be a candidate key for the following instance?

a) {StateName}
b) {#State Universities}
c) {#Faculties}
d) {StateName, #Central Universities, #State Universities}

Answer: a) {StateName}

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These are Data Base Management System Week 1 Assignment Answers

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