Friday, June 8, 2012
Data Models
Data Models
Data Model: A set of concepts to describe the structure of a database, and certain constraints that the database should obey.
Data Model Operations: Operations for specifying database retrievals and updates by referring to the
concepts of the data model. Operations on the data model may include basic operations and user-defined operations.
Example of User Defined Operation
Calculate GPA
Sum(Result GPA * No. of Credits)/Sum(Credits)
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