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Questions and Answers
What does data abstraction generally refer to?
What does data abstraction generally refer to?
- Complex data manipulation techniques
- Highlighting of irrelevant data features
- Storing data in multiple locations
- Suppression of details of data organization and storage (correct)
Which level of data abstraction describes how a record is stored?
Which level of data abstraction describes how a record is stored?
- Physical level (correct)
- Logical level
- Application level
- View level
What does the view level of data abstraction refer to?
What does the view level of data abstraction refer to?
- What application programs see (correct)
- Physical storage details
- Database language and interfaces
- Data manipulation techniques
What is a data model?
What is a data model?
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What is the purpose of data models?
What is the purpose of data models?
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Study Notes
Data Abstraction
- Data abstraction refers to the process of exposing only the necessary information to the outside world while hiding the internal details.
Levels of Data Abstraction
- There are three levels of data abstraction: physical, logical, and view.
Physical Level
- The physical level of data abstraction describes how a record is stored.
View Level
- The view level of data abstraction refers to the user's perspective of the data, focusing on the specific parts of the data that are relevant to the user.
Data Model
- A data model is a conceptual representation of data structures and relationships.
Purpose of Data Models
- The purpose of data models is to provide a blueprint for designing and implementing databases, allowing for better communication and consistency across the organization.
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