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A data model is a collection of concepts that can be used to describe the structure of a database. By structure of the database we mean the data types, relationships, and constraints that should hold on the data. Most data models also include a set of basic operations for specifying retrievals and updates on database. [...] Databases play an important role in almost all areas where they are used including business, engineering, medicine, law, education, and library science, to name a few. A database is a collection of related data, where data means recorded facts. A typical database represents some aspect of the real world and is used for specific purposes [...] |
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