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Questions and Answers
Which of the following is a requirement for a table to qualify as a relation?
Which of the following is a requirement for a table to qualify as a relation?
- Having attributes with non-unique names (correct)
- Having non-unique row values
- Allowing multivalued attributes
- Having non-unique attribute values
What is the primary characteristic of an attribute value in a relation?
What is the primary characteristic of an attribute value in a relation?
- It must be null
- It must be multivalued
- It can be composite
- It must be atomic (correct)
What is the main purpose of candidate keys in a relation?
What is the main purpose of candidate keys in a relation?
- To ensure non-atomic attribute values
- To allow duplicate rows
- To uniquely identify rows (correct)
- To create multivalued attributes
Which normal form deals with the problem of multivalued dependencies?
Which normal form deals with the problem of multivalued dependencies?
What does a unique table name contribute to a relation?
What does a unique table name contribute to a relation?
What are the properties of a relation in a database?
What are the properties of a relation in a database?
Which normal form addresses the problem of multivalued dependencies in a relation?
Which normal form addresses the problem of multivalued dependencies in a relation?
What is the main purpose of candidate keys in a relation?
What is the main purpose of candidate keys in a relation?
What are the constraints for attributes in tables to qualify as a relation?
What are the constraints for attributes in tables to qualify as a relation?
Which component of the relational model ensures the integrity of manipulated data?
Which component of the relational model ensures the integrity of manipulated data?
Which of the following is NOT a property of a relation in a database?
Which of the following is NOT a property of a relation in a database?
What is the primary characteristic of an attribute value in 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?
What is the main purpose of candidate keys in a relation?
Which normal form addresses the problem of multivalued dependencies in a relation?
Which normal form addresses the problem of multivalued dependencies in a relation?
What are the properties of a table to qualify as a relation in a database?
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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