Relational Database Concepts Quiz

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

• To uniquely identify records

• To link two records and tables together

• To store redundant data

• To create a backup of the database

In a relational database, can a foreign key be non-unique?

• Yes, it can be non-unique

• No, it must be unique

• It depends on the database type

• Only if it is a primary key

What is a major issue caused by data inconsistency?

• Faster data processing

• Easier data updates

• Difficulty in updating or querying data

• Improved data security

What is logical data independence?

• The ability to change physical storage without affecting applications

• The ability to modify the logical schema without affecting applications

• The ability to change data types without affecting applications

• The ability to add new data without affecting applications

What is the benefit of having a single parent linked to a child table?

• It allows for data redundancy

• It simplifies data retrieval

• It ensures data consistency

• It allows for multiple parents

What is the effect of redundancy on data updates?

• Makes updates faster

• Makes updates more difficult

• Has no effect on updates

• Improves update accuracy

What is the relationship between a parent and child table in a relational database?

• A child can have multiple parents

• A parent can have multiple children

• A parent and child are the same

• A child cannot have a parent

What does data inconsistency lead to in a database?

• Improved data accuracy

• Easier data retrieval

• Difficulty in data management

• Faster data processing

What is a key feature of logical data independence?

• Changing data types

• Modifying the logical schema

• Encrypting data

• Deleting data

How does data independence benefit database systems?

• By increasing redundancy

• By ensuring flexibility and efficiency

• By slowing down data retrieval

• By complicating data updates