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Questions and Answers
What does the term 'domain' refer to in the context of data modeling?
What does the term 'domain' refer to in the context of data modeling?
- The primary key of a relational database table
- The set of acceptable values that a column is allowed to contain (correct)
- The set of all possible data types in a database
- The total number of records in a database
Which of the following best represents a domain in the given context?
Which of the following best represents a domain in the given context?
- The set of all floating-point numbers greater than 0 and less than 200,000 (correct)
- The total number of records in a database
- The primary key of a database table
- The set of all possible data types in a database
In the given context, what does the domain of 'First Name' represent?
In the given context, what does the domain of 'First Name' represent?
- The set of all possible days in a week
- The set of acceptable values for a primary key
- The set of all floating-point numbers greater than 0 and less than 200,000
- The set of character strings that represent names of people (correct)
In the context of a table, what does 'degree' refer to?
In the context of a table, what does 'degree' refer to?
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What do records/tuples in a table contain?
What do records/tuples in a table contain?
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What is the degree of a table with 6 attributes?
What is the degree of a table with 6 attributes?
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Study Notes
Data Modeling Context
- In the context of data modeling, a domain refers to the set of possible values that an attribute or field can take.
Domain Representation
- A domain is best represented by the set of all possible values that an attribute can have.
Domain of 'First Name'
- The domain of 'First Name' represents the set of all possible first names that can be entered into a database or table.
Degree in a Table
- In the context of a table, the degree refers to the number of attributes or fields in the table.
Records/Tuples in a Table
- Records or tuples in a table contain a single value for each attribute or field.
Degree of a Table
- The degree of a table with 6 attributes is 6.
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