Database Systems: Foreign Keys and Data Redundancy

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What is the primary purpose of controlled redundancy in a relational database?

To eliminate data redundancy

To enhance data retrieval speed

To improve data storage efficiency

To enable tables to be linked together (correct)

What is the consequence of null values in a database when using functions such as COUNT, AVERAGE, and SUM?

They slow down the query execution

They have no impact on the results

They increase the accuracy of the results

They create logical problems (correct)

What is the characteristic of a superkey in a database table?

It is a subset of a composite key

It is a primary key without null values

It uniquely identifies each row (correct)

It is composed of multiple attributes

What is the purpose of a foreign key in a relational database?

To establish relationships between tables Signup and view all the answers

What is the consequence of unnecessary duplication of attribute values in a database?

It creates redundancy Signup and view all the answers

What is the purpose of entity integrity in a relational database?

To ensure each row has a unique identity Signup and view all the answers

What is the characteristic of a composite key in a database table?

It is composed of more than one attribute Signup and view all the answers

What is the purpose of referential integrity in a relational database?

To ensure foreign key values match primary key values Signup and view all the answers

What can null values represent in a database?

Any of the above, including a 'not applicable' condition Signup and view all the answers

What is the benefit of using keys in a relational database?

It enables relationships between tables Signup and view all the answers

Database Systems: Foreign Keys and Data Redundancy

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Questions and Answers

What is the primary purpose of controlled redundancy in a relational database?

What is the consequence of null values in a database when using functions such as COUNT, AVERAGE, and SUM?

What is the characteristic of a superkey in a database table?

What is the purpose of a foreign key in a relational database?

What is the consequence of unnecessary duplication of attribute values in a database?

What is the purpose of entity integrity in a relational database?

What is the characteristic of a composite key in a database table?

What is the purpose of referential integrity in a relational database?

What can null values represent in a database?

What is the benefit of using keys in a relational database?

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