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Questions and Answers
What is the standard model for commercial DBMS products?
Who created the relational model?
What mathematics is used in the relational model?
What is a key that determines other attributes in a relation called?
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What is the term for an attribute or combination of attributes that uniquely identifies each row in a relation?
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Study Notes
Standard Model for Commercial DBMS Products
- Commercial Database Management Systems (DBMS) typically adhere to relational database principles, enabling structured data organization and manipulation.
- Key features include data tables, relationships, data integrity, and support for SQL (Structured Query Language) for data querying.
Creator of the Relational Model
- The relational model was created by Edgar F. Codd in the 1970s.
- Codd's work laid the foundation for modern relational databases and established the theoretical framework for storing data in tables.
Mathematics Used in the Relational Model
- The relational model employs set theory and predicate logic for data organization and querying.
- Key concepts include relations (tables), tuples (rows), and attributes (columns), which help in defining data interactions and constraints.
Key Determining Attributes in a Relation
- A key that determines other attributes in a relation is known as a functional dependency.
- This relationship indicates how one attribute's value can predict another's within a database structure.
Unique Identifiers in a Relation
- An attribute or combination of attributes that uniquely identifies each row in a relation is termed a primary key.
- The primary key ensures that no two rows in a table can have the same values in these identifying attributes, maintaining data integrity.
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Description
Test your knowledge of the relational model with this quiz based on the book "Database Processing Fundamentals, Design, and Implementation" by David M. Kroenke and David J. Auer. Assess your understanding of basic relational terminology, characteristics of relations, and alternative terminology used in describing the relational model.
