The Problem of Incomplete Information in Relational Databases (Lecture Notes in Computer Science)

The Problem of Incomplete Information in Relational Databases (Lecture Notes in Computer Science)
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The Issue of Incomplete Details in Relational Databases (Lecture Notes in Personal computer Science) Description

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In a relational database is recorded as rows of tables. But in a lot of practical situations, the info accessible is incomplete and the values ​​of some columns are missing. But no program existing database permits the user to enter null values ​​in the database. This monograph analyzes the issues produced by permitting null values ​​in relational databases. The analysis consists of semantic, syntactic and aspects of computational science. Algorithms for search, evaluation, implementation and updates due to the presence of zero values ​​are also listed. Analysis of the complexity of the algorithms of thinking that a practical standpoint, the database is stored in tables Horn as generalizations of ordinary relations, so that NULL values ​​and limitations Horn clause sort these nulls. Horn tables efficiently support a wide class of troubles, addictions and update The Dilemma of Incomplete Data in Relational Databases (Lecture Notes in Pc Science)

\n\nThe Difficulty of Incomplete Info in Relational Databases (Lecture Notes in Computer Science) Ebook

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