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Questions and Answers
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?
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?
- Partially dependent on A
- Totally independent of A
- Functionally dependent on A (correct)
- Superkey dependent on A
What type of key is composed of more than one attribute?
What type of key is composed of more than one attribute?
- Candidate key
- Primary key
- Composite key (correct)
- Superkey
What is the purpose of controlled redundancy in a relational database?
What is the purpose of controlled redundancy in a relational database?
- To enable tables to be linked together (correct)
- To reduce data entry errors
- To increase data redundancy
- To create logical problems in relational tables
What does a foreign key (FK) contain in a related table?
What does a foreign key (FK) contain in a related table?
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What is the problem with nulls in a relational database?
What is the problem with nulls in a relational database?
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What is the purpose of entity integrity in a relational database?
What is the purpose of entity integrity in a relational database?
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What type of key is a superkey without unnecessary attributes?
What type of key is a superkey without unnecessary attributes?
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What is the purpose of referential integrity in a relational database?
What is the purpose of referential integrity in a relational database?
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What is the problem with unnecessary duplication of attribute values?
What is the problem with unnecessary duplication of attribute values?
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What is the purpose of a primary key in a relational database?
What is the purpose of a primary key in a relational database?
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