10 Questions
What is an attribute B said to be if all rows in a table that agree in value for A also agree in value for B?
Functionally dependent on A
What type of key is composed of more than one attribute?
Composite key
What is the purpose of controlled redundancy in a relational database?
To enable tables to be linked together
What does a foreign key (FK) contain in a related table?
A primary key value
What is the problem with nulls in a relational database?
They can create logical problems when tables are linked
What is the purpose of entity integrity in a relational database?
To ensure each row has a unique identity
What type of key is a superkey without unnecessary attributes?
Candidate key
What is the purpose of referential integrity in a relational database?
To enable tables to be linked together
What is the problem with unnecessary duplication of attribute values?
It can create logical problems when tables are linked
What is the purpose of a primary key in a relational database?
To ensure each row has a unique identity
Test your understanding of foreign keys, primary keys, and data redundancy in database systems. Learn how to control data redundancies and anomalies in your database.
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