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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.
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Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - 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 queriesdependencies and updates.
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Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - The papers in this volume represent the technical program of the 8th Biennial Workshop on Data Bases and Programming Languages (DBPL 2001), that was held during September 8 10, 2001, in Frascati, located on the beautiful hills surrounding Rome, in an… area favored by the ancient Roman patricians who built their summer residences there. DBPL 2001 continued the tradition of - cellence initiated by its predecessors in Rosco , Finist` ere (1987), Salishan, O- gon (1989), Nafplion, Argolida (1991), Manhattan, New York (1993), Gubbio, Umbria (1995), Estes Park, Colorado (1997), and Kinloch Rannoch, Scotland (1999). Databases grew out of a separation between physical and logical data, thus enabling high-level query languages. Database query languages have evolved in expressive power and structural capabilities. Programming languages have seen a development from assembly languages to high-level declarative paradigms. Thus the two areas approach each other as they mature. Earlier successful cro- fertilizationsbetweenthe eldsincludethecombinationofrelationaltheory,type theory and object-oriented languages, resulting in object-oriented databases, object-relational databases and persistent programming languages. The com- nation of database logic programming and constraint programming p- duceddeductiveandconstraintdatabases.Recently,withtheemergenceofse- structured data models, there is a renewed synergy between databases and p- gramminglanguages,inparticularinthedesignoflanguagestomanipulateXML data. The DBPL 2001 Program Co-Chairs were Giorgio Ghelli (Pisa) and G osta Grahne(Montr eal).TheProgramCommitteeMemberswereCatrielBeeri(Je- salem),DiegoCalvanese(Rome),RichardConnor(Glasgow),AlonHalevy(Se- tle), Leonid Libkin (Toronto), Gianni Mecca (Potenza), Frank Neven (Limburg), Benjamin Pierce (Philadelphia), Chris Ramming (Menlo Park), J er ome Sim eon (Murray Hill), Victor Vianu (San Diego), and Philip Wadler (Basking Ridge).
