data model in DBMS, Database Management System

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how many types of data model in DBMS? explain data abstraction with its different level

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What is a PROJECT operation? The project operation is a unary operation that returns its argument relation with particular attributes left out. Projection is shown by pie (π).

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Consider an information system designed for an online company which provides IT products and services. These include desktops, laptops, networking products, IT books, parts, and te

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