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Welcome to the Relational Databases MCQs Page

Dive deep into the fascinating world of Relational Databases with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Relational Databases, a crucial aspect of DBMS. In this section, you will encounter a diverse range of MCQs that cover various aspects of Relational Databases, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within DBMS.

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Check out the MCQs below to embark on an enriching journey through Relational Databases. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of DBMS.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Relational Databases. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Relational Databases MCQs | Page 6 of 12

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Q51.
When mapping a ternary relationship with an associative entity into a relation which of the following is true?

a.

One relation is created.

b.

Two relations are created.

c.

Three relations are created.

d.

Four relations are created.

Discuss
Answer: (d).Four relations are created.
Q52.
When mapping a supertype/subtype relationship which of the following is true?

a.

The supertype primary key is assigned to each subtype.

b.

The subtype primary key is assigned to each supertype.

c.

There is no link between the supertype/subtype entities.

d.

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

Discuss
Answer: (a).The supertype primary key is assigned to each subtype.
Q53.
If no multivalued attributes exist in a relation, then the relation is in what normal form?

a.

First normal form

b.

Second normal form

c.

Third normal form

d.

Fourth normal form

Discuss
Answer: (a).First normal form
Q54.
If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal form?

a.

First normal form

b.

Second normal form

c.

Third normal form

d.

Fourth normal form

Discuss
Answer: (b).Second normal form
Q55.
A transitive dependency is which of the following?

a.

A functional dependency between two or more key attributes.

b.

A functional dependency between two or more nonkey attributes.

c.

A relation that is in first normal form.

d.

A relation that is in second normal form.

Discuss
Answer: (b).A functional dependency between two or more nonkey attributes.
Q56.
What is the best data type definition for Oracle when a field is alphanumeric and has a fixed length?

a.

VARCHAR2

b.

CHAR

c.

LONG

d.

NUMBER

Discuss
Answer: (b).CHAR
Q57.
If a denormalization situation exists with a many-to-many or associative binary relationship, which of the following is true?

a.

All fields are stored in one relation.

b.

All fields are stored in two relations.

c.

All fields are stored in three relations.

d.

All fields are stored in four relations.

Discuss
Answer: (b).All fields are stored in two relations.
Q58.
Which of the following is an advantage of partitioning?

a.

Complexity

b.

Inconsistent access speed

c.

Extra space

d.

Security

Discuss
Answer: (d).Security
Q59.
Sequential retrieval on a primary key for sequential file storage has which of the following features?

a.

Very fast

b.

Moderately fast

c.

Slow

d.

Impractical

Discuss
Answer: (a).Very fast
Q60.
A rule of thumb for choosing indexes for a relational database includes which of the following?

a.

Indexes are more useful on smaller tables.

b.

Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries.

c.

Do not specify a unique index for the primary key of each table.

d.

Be careful indexing attributes that have null values.

Discuss
Answer: (d).Be careful indexing attributes that have null values.
Page 6 of 12

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