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Questions and Answers
Which of the following is a requirement for a table to qualify as a relation?
What is the primary characteristic of an attribute value in a relation?
What is the main purpose of candidate keys in a relation?
Which normal form deals with the problem of multivalued dependencies?
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What does a unique table name contribute to a relation?
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What are the properties of a relation in a database?
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Which normal form addresses the problem of multivalued dependencies in a relation?
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What is the main purpose of candidate keys in a relation?
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What are the constraints for attributes in tables to qualify as a relation?
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Which component of the relational model ensures the integrity of manipulated data?
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Which of the following is NOT a property of a relation in a database?
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What is the primary characteristic of an attribute value in a relation?
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What is the main purpose of candidate keys in a relation?
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Which normal form addresses the problem of multivalued dependencies in a relation?
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What are the properties of a table to qualify as a relation in a database?
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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.
