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Questions and Answers
What is the smallest element in the hierarchy of data organization?
What do we call a group of related fields in data organization?
Which key uniquely identifies a record in a database?
What does program-data dependence mean in traditional file-oriented applications?
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In data organization, what is an attribute?
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What is the collection of related records called in data organization?
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What is one of the benefits of using the relational model for organizing data?
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Which term is used in the relational model to refer to the columns of tables?
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What is the purpose of an entity-relationship (ER) diagram in database design?
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In the context of data modeling, what does 'projecting' refer to?
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What are allowable values for the attributes in a relational database called?
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Which data manipulation technique involves combining rows from two tables based on a related column?
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Study Notes
Data Organization Fundamentals
- The smallest element in the hierarchy of data organization is a bit.
- A group of related fields is known as a record.
- The primary key uniquely identifies each record in a database.
- Program-data dependence refers to the tight coupling of data and application programs in traditional file-oriented systems, making changes to one often necessitate changes to the other.
Attributes and Records
- In data organization, an attribute is a characteristic or property of an entity represented in a database.
- A collection of related records is termed a file.
Relational Model Advantages
- One benefit of using the relational model for data organization is improved data integrity and reduced data redundancy.
- In the relational model, columns of tables are referred to as attributes.
Database Design and Data Modeling
- An entity-relationship (ER) diagram serves to visually represent the relationships between entities in a database design, aiding in structure planning.
- In data modeling, projecting refers to selecting specific columns from a table to create a new table that focuses on the data of interest.
Attribute Values and Data Manipulation
- Allowable values for the attributes in a relational database are called domain values.
- The data manipulation technique that combines rows from two tables based on a related column is known as joining.
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Description
Learn about the hierarchical organization of data in databases, starting from bits and bytes to files and databases. Explore the relationships between bits, bytes, fields, records, and files in data storage.
