An entity-based approach to query processing in relational databases

Christensen

Information and Software Technology

2000

Section: Discussionmentioning

confidence: 99%

Query language approach based on the deductive object-oriented database paradigm

Christensen

Information and Software Technology

2000

“…The full integration of three classes of operations was defined in (Järvelin & Niemi, 1992). These include extended RA, deductive and entity-based (Järvelin & Niemi, 1993) operations.…”

Section: Rel-to-one-value(rel-evaluate(g Rdb Cb)) If Rel-expression(g) Set-to-one-value(class-evaluate(g Rdb Cb)) If Class-operation(g)mentioning

confidence: 99%

Deductive information retrieval based on classifications

1993

J. Am. Soc. Inf. Sci.

Self Cite

Modern fact databases contain abundant data ciassified through several classifications.Typically, users must consult these classifications in separate manuals or files, thus making their effective use difficult. Contemporary database systems do little to support deductive use of classifications.In this study we show how deductive data management techniques can be applied to the utilization of data value classifications. Computation of transitive class relationships is of primary importance here. We define a representation of classifications which supports transitive computation and present an operation-oriented deductive query language tailored for classificationbased deductive information retrieval. The operations of this language are on the same abstraction level as relational algebra operations and can be integrated with these to form a powerful and flexible query ianguage for deductive information retrieval. We define the integration of the operations and demonstrate the usefulness of the language in terms of several sample queries.

show abstract

A straightforward NF2 relational interface with applications in information retrieval

Information Processing &Amp; Management

1995