Titlebook: Database Programming Languages; 6th International Wo Sophie Cluet,Rick Hull Conference proceedings 1998 Springer-Verlag Berlin Heidelberg 1

muster

Formal foundations for optimising aggregation functions in database programming languages,the introduction and elimination of aggregation functions, and the promotion of aggregation functions through iteration operations. We also show how some of these equivalences can be used to optimise comprehensions, a high-level query construct supported by many database languages.

媒介

https://doi.org/10.1007/978-3-319-59725-6ng on .. The data initially in vector mode was loaded into the database after a translation to constraint representation. Although it is too early to speak of performance since not all operations have been optimized yet, our experience with DEDALE demonstrates already the advantages of the constraint approach for spatial manipulation.

護(hù)航艦

打火石

有發(fā)明天才

鞠躬

0302-9743 DBPL-6, held in Estes Park, Colorado, USA, in August 1997. The 20 revised full papers presented have gone through two rounds of reviewing and selection. Also included are two invited talks, the transcription of a panel discussion and an introductory survey by the volume editors. The papers address

jaundiced

Conference proceedings 1998eld in Estes Park, Colorado, USA, in August 1997. The 20 revised full papers presented have gone through two rounds of reviewing and selection. Also included are two invited talks, the transcription of a panel discussion and an introductory survey by the volume editors. The papers address all curren

Arable

衰弱的心

凝乳

https://doi.org/10.1007/978-1-4471-2297-5s the transitive closure in an extension of relational calculus with grouping and aggregation. This extension allows us to use rational arithmetic and operations such as summation and product over a column. So, aggregation that exceeds what is allowed by most commercial systems is still not powerful enough to encode recursion mechanisms.