The Data Model
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A data model is an abstract model containing concepts to describe a database's structure, the operations for manipulating those structures, and the constraints the database should obey.
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A city map's legend — what exists, what moves, what's forbidden — is the same three-part idea.
Watch for
Structure, operations, constraints — a model missing one is incomplete.