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Logical Database Design and Relational Model Quiz

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Logical Database Design and Relational Model Quiz

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Questions and Answers

Which of the following is a requirement for a table to qualify as a relation?

Having attributes with non-unique names (correct)

Having non-unique row values

Allowing multivalued attributes

Having non-unique attribute values

What is the primary characteristic of an attribute value in a relation?

It must be null

It must be multivalued

It can be composite

It must be atomic (correct)

What is the main purpose of candidate keys in a relation?

To ensure non-atomic attribute values

To allow duplicate rows

To uniquely identify rows (correct)

To create multivalued attributes

Which normal form deals with the problem of multivalued dependencies?

Third normal form (3NF) Signup and view all the answers

What does a unique table name contribute to a relation?

It ensures data integrity Signup and view all the answers

What are the properties of a relation in a database?

Unique name, atomic attribute values, unique rows, and unique column names Signup and view all the answers

Which normal form addresses the problem of multivalued dependencies in a relation?

First normal form Signup and view all the answers

What is the main purpose of candidate keys in a relation?

To uniquely identify each row in a relation Signup and view all the answers

What are the constraints for attributes in tables to qualify as a relation?

Atomic attribute values and unique rows Signup and view all the answers

Which component of the relational model ensures the integrity of manipulated data?

Data integrity mechanisms Signup and view all the answers

Which of the following is NOT a property of a relation in a database?

Every attribute value must be composite Signup and view all the answers

What is the primary characteristic of an attribute value in a relation?

It must be atomic Signup and view all the answers

What is the main purpose of candidate keys in a relation?

To uniquely identify each row in the table Signup and view all the answers

Which normal form addresses the problem of multivalued dependencies in a relation?

First normal form (1NF) Signup and view all the answers

What are the properties of a table to qualify as a relation in a database?

Ensuring unique table name and atomic attribute values Signup and view all the answers

Study Notes

Requirements for a Relation

A table must have a unique table name to qualify as a relation.
The constraints for attributes in tables to qualify as a relation are:
- Each row must be unique.
- Each column must have a unique name.
- All values in a column must be of the same data type.
- Each value in a row must be a single value.

Primary Characteristic of an Attribute Value

The primary characteristic of an attribute value in a relation is that it is atomic, meaning it cannot be divided into smaller parts.

Purpose of Candidate Keys

The main purpose of candidate keys in a relation is to identify a unique row in a table.

Normal Forms

The normal form that deals with the problem of multivalued dependencies is 4th normal form.
The normal form that addresses the problem of multivalued dependencies in a relation is also 4th normal form.

Relational Model

The component of the relational model that ensures the integrity of manipulated data is constraints.

Properties of a Relation

The properties of a relation in a database are:
- Each row must be unique.
- Each column must have a unique name.
- All values in a column must be of the same data type.
- Each value in a row must be a single value.
- Each row has a unique combination of values.
- No two rows have the same combination of values.

Non-Property of a Relation

A relation in a database does not have a specific order of rows.

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Description

Test your knowledge on logical database design and the relational model with this quiz. The quiz covers topics such as relation properties, candidate keys, normal forms, merging relations, and transforming diagrams to relations.