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Zustand: New. In English.

Zustand: New. In English.

Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - Invited Contribution.- Typechecking for Semistructured Data.- Semistructured Data.- Optimization Properties for Classes of Conjunctive Regular Path Queries.- View-Based Query Answering and Query Containment over Semistructured Data.- Model-Checking Based Data Retrieval.- OLAP and Data Mining.- A Temporal Query Language for OLAP: Implementation and a Case Study.- Attribute Metadata for Relational OLAP and Data Mining.- On Monotone Data Mining Languages.- XML.- Reasoning about Keys for XML.- TAX: A Tree Algebra for XML.- A Rule-Based Querying and Updating Language for XML.- Spatial Databases.- Linear Approximation of Semi-algebraic Spatial Databases Using Transitive Closure Logic, in Arbitrary Dimension.- A Theory of Spatio-temporal Database Queries.- Systems, Schema Integration, Index Concurrency.- An Application-Specific Database.- A Model Theory for Generic Schema Management.- View Serializable Updates of Concurrent Index Structures.- User Languages.- SQL4X: A Flexible Query Language for XML and Relational Databases.- ERX-QL: Querying an Entity-Relationship DB to Obtain XML Documents.- Rules.- Optimising Active Database Rules by Partial Evaluation and Abstract Interpretation.- Simulation of Advanced Transaction Models Using GOLOG.…

Zustand: Sehr gut. Zustand: Sehr gut | Sprache: Englisch | Produktart: Bücher | In a relational database the information is recorded as rowsin tables. However, in many practical situations theavailable information is incomplete and the values for somecolumns are missing. Yet few existing database managementsystems allow the user to enter null values in the database.This monograph analyses the problems raised by allowing nullvalues in relational databases. The analysis coverssemantical, syntactical, and computational aspects.Algorithms for query evaluation, dependency enforcement andupdates in the presence of null values are also given.The analysis of the computational complexity of thealgorithms suggests that from a practical point of view thedatabase should be stored as Horn tables, which aregeneralizations of ordinary relations, allowing null valuesand Horn clause-like restrictions on these null values. Horntables efficiently support a large class of queries,dependencies and updates.…

Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - A null value in a relational database represents missing information. This monograph analyses the problems raised by allowing null values in relational databases. Semantical, syntactical, and computational aspects are covered.…