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Questions and Answers
Which of the following statements is true about attributes?
Which of the following statements is true about attributes?
- Attributes can only be optional.
- Domains are not related to attributes.
- Attributes can be simple or composite (correct)
- Primary keys identify sets of possible values for attributes.
Which of the following is true about multi-valued attributes?
Which of the following is true about multi-valued attributes?
- They are implemented in RDBMS.
- They should not be implemented in RDBMS. (correct)
- They are made up of more than one attribute
- They can only have one value
What are derived attributes?
What are derived attributes?
- Attributes that are required
- Attributes that are calculated from other attributes. (correct)
- Attributes that are made up of more than one attribute
- Attributes that identify entity instances.
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Study Notes
- Attributes can be required or optional.
- Domains are sets of possible values for attributes.
- Primary keys uniquely identify entity instances.
- Composite identifiers are made up of more than one attribute.
- Attributes can be simple or composite.
- Single-valued attributes can only have one value.
- Multi-valued attributes have many values but should not be implemented in RDBMS.
- Implementing multi-valued attributes involves creating new attributes or entities.
- Derived attributes are calculated from other attributes.
- Computed attributes can be simple or complex.
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