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why are older data models are being replaced by new data models

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What are ways of finding out either an update is required or not for derived attributes? The ways to find out an update is required or, not are as: Explicit update

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Multilevel Index The Multilevel Index is a modification of the secondary level index system. In this system we might be use even more number of levels in case the table is eve

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Normalization :It is a process of examine the given relation schemas based on their primary key and Functional Dependencies (FDs) to achieve the properties Minimizing redun

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Boyce-codd normal form (bcnf), Boyce-Codd Normal Form (BCNF) The relati...

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