失败主义者
发表于 2025-3-27 00:38:41
Finding Equivalent Rewritings,eration to the fragment of the language of conjunctive queries with aggregation that is called “central rewritings.” Our focus will be on finding (minimal) equivalent rewritings in an efficient way. Other languages for rewritings will be discussed in other parts of the book.
折磨
发表于 2025-3-27 04:18:22
Book 2019Latest editionintegration, data warehousing, website design and, recently, database-as-a-service and data placement in cloud systems...This book assembles foundational work on answering queries using views in a self-contained manner, with an effort to choose material that constitutes the backbone of the research.
Handedness
发表于 2025-3-27 09:15:00
https://doi.org/10.1007/978-3-322-94951-6eration to the fragment of the language of conjunctive queries with aggregation that is called “central rewritings.” Our focus will be on finding (minimal) equivalent rewritings in an efficient way. Other languages for rewritings will be discussed in other parts of the book.
不满分子
发表于 2025-3-27 11:14:32
Queries and Views,to which they give rise (Section 1.2). An informal discussion follows about specific technical problems in answering queries using views with concrete examples (Section 1.3). Then, for completeness and consistency of notation, we give formal definitions for the relational data model and query langua
整顿
发表于 2025-3-27 16:58:52
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发表于 2025-3-27 19:36:43
Answering Queries in Data Exchange,, for a set of views . defined on the schema of ., we are given an instance ., which is either the set of all tuples in .(.) or its subset. So, being unable to compute . directly on ., we have to find techniques for answering . on the instance . whose schema is that of the view relations. The approa
overreach
发表于 2025-3-27 22:15:49
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CLASP
发表于 2025-3-28 04:27:24
Tree-Structured Records Queried with SQL Dialect,d to think of the instances of a tree data type as if they were tuples of a relation. We present in this chapter a data model which is defined by neither a standard relation (like the relational model) nor by a tree (like an XML document), but it is a “combination” of both. Thus, it enables the use
粗糙
发表于 2025-3-28 08:06:27
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事先无准备
发表于 2025-3-28 14:00:16
2153-5418 ve query languages. Chapter 8 presents the data model for XML documents and the XPath query language, and Chapter 9 provides a theoretical presentation of tree-978-3-031-00743-9978-3-031-01871-8Series ISSN 2153-5418 Series E-ISSN 2153-5426