genial
发表于 2025-3-21 17:33:59
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不如乐死去
发表于 2025-3-21 22:10:37
Vocabulary-based Target Restrictions,the goal is to translate it into a query over a . vocabulary, and the constraints relate tables in the source vocabulary to the target vocabulary. This relates to a broad range of problems in databases, including view-based query reformulation, data integration, and query optimization. We will show
crucial
发表于 2025-3-22 02:26:05
Access Methods and Integrity Constraints,elations, perhaps restricted to be positive existential or existential. In this chapter we deal with a finer notion of reformulation, where the target has to satisfy ., as was illustrated in Examples 1.3 and 1.4.
深陷
发表于 2025-3-22 07:42:59
Reformulation Algorithms for TGDs,ould:.Up until now the last step was always performed through an appeal to an interpolation algorithm. We have shown that this algorithm can be applied to yield optimal worst-case complexity for many reformulation problems—for example, Proposition 2.20 shows that the algorithm achieves this for refo
Enthralling
发表于 2025-3-22 11:26:35
Low-cost Plans Via Proof Search,(e.g., access methods), whenever such a reformulation exists. We now look at finding efficient reformulations. We focus on the setting where the interface is given by access methods, the goal is to generate an . -plan equivalent to a CQ ., and where the constraints in our schema consist of TGDs. In
SLING
发表于 2025-3-22 13:32:13
978-3-031-00728-6Springer Nature Switzerland AG 2016
SLING
发表于 2025-3-22 19:08:04
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Digitalis
发表于 2025-3-22 23:43:55
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debacle
发表于 2025-3-23 02:41:48
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摇曳
发表于 2025-3-23 06:03:13
Brigitte d’Andréa-Novel,Michel De Laraw each chapter relates to the motivating examples. The remainder of the chapter reviews the basic definitions concerning the database models, constraint languages, and query languages used in the text. In the process we will go over some “fine print” concerning the relationship between the languages