Download Database System Concepts and Architecture

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Transcript
Data Models
• A collection of concepts that can be used to
describe the structure of a database (data types,
relationships, and constraints)
• basic operations (retrieval and updates)
• specify the dynamic aspect or behavior of a
database application( user-defined operations )
• example: COMPUTE_GPA, which can be applied
to a STUDENT object
Jan 29, 2002