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Databases - Relational model

Avatto > > GATE COMPUTER SCIENCE > > Practice Questions > > Computer Science And Information Technology > > Databases > > Relational model

1. In tuple relational calculus P1 → P2 is equivalent to

A
¬ P1 ∨ P2
B
P1 ∨ P2
C
P1 ∧ P2
D
P1 ∧ ¬P2

Answer
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Option : A
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2. A logical schema

A
Is the entire database.
B
describe data in terms of relational tables and columns, object-oriented classes, and XML tags.
C
Describes how data is actually stored on disk.
D
Both (A) and (C)

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Option : A
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3. Related fields in a database are grouped to form a

A
Data file.
B
Data record.
C
Menu.
D
Bank.

Answer
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Option : B
Explanation : Related data fields in a database are grouped to form a data record. (A record is a collection of related fields)

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4. The database environment has all of the following components except:

A
Users.
B
Separate files
C
Database.
D
Database administrator

Answer
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Option : B
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5. The way a particular application views the data from the database that the application uses is a

A
Module.
B
Relational model.
C
Schema.
D
Sub schema.

Answer
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Option : D
Explanation :

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