OperaV1, France, Analysis, bibRecord, 000B20

Query languages for relational multidatabases

Identifieur interne : 000B20 ( France/Analysis ); précédent : 000B19; suivant : 000B21

Query languages for relational multidatabases

Auteurs : John Grant [États-Unis] ; Witold Litwin [France] ; Nick Roussopoulos [États-Unis] ; Timos Sellis [États-Unis]

Source :

The VLDB Journal [ 1066-8888 ] ; 1993-04-01.

RBID : ISTEX:845410AAD455A8C454CEECD1F8D6603E03A523CA

Abstract

Abstract: With the existence of many autonomous databases widely accessible through computer networks, users will require the capability to jointly manipulate data in different databases. A multidatabase system provides such a capability through a multidatabase manipulation language, such as MSQL. We propose a theoretical foundation for such languages by presenting a multirelational algebra and calculus based on the relational algebra and calculus. The proposal is illustrated by various queries on an example multidatabase. It is shown that properties of the multirelational algebra may be used for optimization and that every multirelational algebra query can be expressed as a multirelational calculus query. The connection between the multirelational languages and MSQL, the multidatabase version of SQL, is also investigated.

Url:

https://api.istex.fr/document/845410AAD455A8C454CEECD1F8D6603E03A523CA/fulltext/pdf

DOI: 10.1007/BF01232185

Affiliations:

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ISTEX:845410AAD455A8C454CEECD1F8D6603E03A523CA

Le document en format XML

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<author><name sortKey="Litwin, Witold" sort="Litwin, Witold" uniqKey="Litwin W" first="Witold" last="Litwin">Witold Litwin</name>
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<author><name sortKey="Roussopoulos, Nick" sort="Roussopoulos, Nick" uniqKey="Roussopoulos N" first="Nick" last="Roussopoulos">Nick Roussopoulos</name>
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<author><name sortKey="Sellis, Timos" sort="Sellis, Timos" uniqKey="Sellis T" first="Timos" last="Sellis">Timos Sellis</name>
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<front><div type="abstract" xml:lang="en">Abstract: With the existence of many autonomous databases widely accessible through computer networks, users will require the capability to jointly manipulate data in different databases. A multidatabase system provides such a capability through a multidatabase manipulation language, such as MSQL. We propose a theoretical foundation for such languages by presenting a multirelational algebra and calculus based on the relational algebra and calculus. The proposal is illustrated by various queries on an example multidatabase. It is shown that properties of the multirelational algebra may be used for optimization and that every multirelational algebra query can be expressed as a multirelational calculus query. The connection between the multirelational languages and MSQL, the multidatabase version of SQL, is also investigated.</div>
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Query languages for relational multidatabases

Query languages for relational multidatabases

Source :

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

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