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Database merge
Database merge

... rebuild the three level (physical, logical, semantic) models for the source and the target database allow the business to compare the two semantic models and to define the “mapping” between source and target model at semantic level based on this mapping compare automatically source and target models ...
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Spreadsheet As a Relational Database Engine
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Querying Database - San Francisco State University

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The Database Concept

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Entity–attribute–value model

Entity–attribute–value model (EAV) is a data model to describe entities where the number of attributes (properties, parameters) that can be used to describe them is potentially vast, but the number that will actually apply to a given entity is relatively modest. In mathematics, this model is known as a sparse matrix. EAV is also known as object–attribute–value model, vertical database model and open schema.
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