Data redundency, Database Management System

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How to reduce data redundency

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What does conceptual design work? A conceptual design involves modelling independent of the DBMS.

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Mappings between Levels and Data Independence The 3 levels of abstraction in the database do not exist separately of each other. There must be some correspondence, or mapping

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What is the difference among a primary index and a secondary index? Primary Index: A primary index is an ordered file whose records are of fixed length along with two fields.

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What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.

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