muster
发表于 2025-3-25 03:59:20
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
发表于 2025-3-25 09:53:16
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.
护航舰
发表于 2025-3-25 15:37:02
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打火石
发表于 2025-3-25 19:33:29
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有发明天才
发表于 2025-3-25 21:47:24
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鞠躬
发表于 2025-3-26 02:13:38
0302-9743DBPL-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
发表于 2025-3-26 07:20:19
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
发表于 2025-3-26 10:34:21
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衰弱的心
发表于 2025-3-26 14:12:50
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凝乳
发表于 2025-3-26 19:52:46
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.