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In the context of relational databases, what is a relation instance denoted by?
In the context of relational databases, what is a relation instance denoted by?
- A schema
- A table (correct)
- A domain
- A key
What is the term used for the indivisible set of allowed values for each attribute in a relational database?
What is the term used for the indivisible set of allowed values for each attribute in a relational database?
- Tuple
- Domain (correct)
- Relation
- Schema
What is a member of every domain in a relational database, representing an unknown or missing value?
What is a member of every domain in a relational database, representing an unknown or missing value?
- Atomic value
- Relation instance
- Null (correct)
- Tuple
What is the term used to describe the set of attributes for a relation in a relational database?
What is the term used to describe the set of attributes for a relation in a relational database?
What are the individual rows in a table representing a relation called in the context of relational databases?
What are the individual rows in a table representing a relation called in the context of relational databases?
What is the term used to describe the structure that specifies the set of attributes for a relation in a relational database?
What is the term used to describe the structure that specifies the set of attributes for a relation in a relational database?
What is the term used for the current values of a relation specified by a table in a relational database?
What is the term used for the current values of a relation specified by a table in a relational database?
What is the term for the indivisible set of allowed values for each attribute in a relational database?
What is the term for the indivisible set of allowed values for each attribute in a relational database?
In the context of relational databases, what is an element of a relation called and how is it represented?
In the context of relational databases, what is an element of a relation called and how is it represented?
What is the term used for the attributes or columns of a relation in a relational database?
What is the term used for the attributes or columns of a relation in a relational database?
In the context of relational databases, what is the term for the structure that specifies the set of attributes for a relation?
In the context of relational databases, what is the term for the structure that specifies the set of attributes for a relation?
What is the term used to describe the complete set of individual rows in a table representing a relation in relational databases?
What is the term used to describe the complete set of individual rows in a table representing a relation in relational databases?
In relational databases, what is the special value that is a member of every domain and represents an unknown or missing value?
In relational databases, what is the special value that is a member of every domain and represents an unknown or missing value?
What term is used for the set of allowed values for each attribute in a relational database?
What term is used for the set of allowed values for each attribute in a relational database?
In the context of relational databases, what is an element of a relation called and how is it represented?
In the context of relational databases, what is an element of a relation called and how is it represented?
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Study Notes
Relational Database Concepts
- A relation instance is denoted by a table in a relational database.
Domains and Attributes
- The indivisible set of allowed values for each attribute in a relational database is called a domain.
- The set of attributes for a relation is called a schema.
Null Values
- Null is a member of every domain in a relational database, representing an unknown or missing value.
Table Structure
- The individual rows in a table representing a relation are called tuples.
- The structure that specifies the set of attributes for a relation is called a relation schema.
Relation Instances
- The current values of a relation specified by a table in a relational database are called a relation instance.
- An element of a relation is called a tuple, and it is represented by a row in a table.
Database Components
- The attributes or columns of a relation are called attributes.
- The complete set of individual rows in a table representing a relation is called a relation instance.
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