Relational Databases Mcqs

Our collections of Multiple choice questions and answers focuses on study of ” Relational Databases “. These questions are chosen from a collection of most authoritative and best reference books on DBMS.Our aim is to prepare an individual for competitive exams like NTS | GAT | ECAT | Data Warehouse jobs | Data Mining | DB administration jobs | Nadra Jobs | Software House and Data Base and Web Developer jobs | University and College entrance exams and various tests and job interviews. One should practice our Mcqs to assimilate knowledge on Relational Databases comprehensively.

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31.
The relational model consists of:

Data in the form of tables.

Data redundancy.

Operations using non-SQL languages.

Unorganized data.

32.
A primary key is which of the following?

Any attribute

An attribute that uniquely identifies each row

An attribute that uniquely identifies each column

A derived attribute

33.
A foreign key is which of the following?

Any attribute

The same thing as a primary key

An attribute that serves as the primary key of another relation

None of the above.

34.
Relations are:

Two-dimensional tables.

Three-dimensional tables.

Four-dimensional tables.

Five-dimensional tables.

35.
A relation has which of the following properties?

Each row is not unique.

Attributes can have the same name within a given table.

Each relation has a unique name.

The order of the columns is significant.

36.
The entity integrity rule states that:

No primary key attribute may be null.

No primary key can be composite.

No primary key may be unique.

No primary key may be equal to a value in a foreign key.

37.
When mapping a multivalued attribute into a relation which of the following is true?

One relation is created.

Two relations are created.

Three relations are created.

Four relations are created.

38.
When mapping a regular entity into a relation which of the following is true?

One relation is created.

Two relations are created.

Three relations are created.

Four relations are created.

39.
When mapping a binary many-to-many relationship into a relation which of the following is true?

One relation is created.

Two relations are created.

Three relations are created.

Four relations are created.

40.
When mapping a many-to-many unary relationship into a relation which of the following is true?

One relation is created.

Two relations are created.

Three relations are created.

Four relations are created.

41.
When mapping a ternary relationship with an associative entity into a relation which of the following is true?

One relation is created.

Two relations are created.

Three relations are created.

Four relations are created.

42.
When mapping a supertype/subtype relationship which of the following is true?

The supertype primary key is assigned to each subtype.

The subtype primary key is assigned to each supertype.

There is no link between the supertype/subtype entities.

There is no primary key/foreign key relationship between a supertype/subtype.

43.
If no multivalued attributes exist in a relation, then the relation is in what normal form?

First normal form

Second normal form

Third normal form

Fourth normal form

44.
If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal form?

First normal form

Second normal form

Third normal form

Fourth normal form

45.
A transitive dependency is which of the following?

A functional dependency between two or more key attributes.

A functional dependency between two or more nonkey attributes.

A relation that is in first normal form.

A relation that is in second normal form.

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