منابع مشابه
A Practical Query Language for Graph DBs
Query languages for current graph DB systems lack clear syntax and semantics, which difficults the understanding of its expressiveness and complexity. In particular, many of them suffer from poor performance due to the inherently high complexity of the queries they can express. We propose propositional dynamic logic (PDL) as a yardstick query language for graph database engines, based on the fa...
متن کاملOn the Query Evaluation in Document DBs
In this paper, we study the query evaluation in document databases. First, we show that a query represented in an XML language can be generally considered as a labeled tree, and the evaluation of such a query is in fact a tree embedding problem. Then, we propose a strategy to solve this problem, based on dynamic programming. For the ordered tree embedding, the proposed algorithm needs only O(|T...
متن کاملNatural Language Query Filtration in the Conceptual Query Language
Natural language (NL) interfaces for DB query formulation have always been recognized as a much needed enhancement for end-users. Poor performances with earlier NL systems had led to a lull in research in this field. However, latter-day experiments and systems appear to be sufficiently more promising to warrant continued and further research in this area. This study proposes an experimental que...
متن کاملTowards Trie-Based Query Caching in Mobile DBS
The usage of mobile equipment like PDAs, mobile phones, Tablet PCs or laptops is already common in our current information society. Typically, mobile information systems work in a context dependent (e.g. location dependent) manner which means that queries differ mostly only in some context-related predicates on the same set of relations. Considering this characteristics, query processing on mob...
متن کاملThe Constellation Query Language
Collaboration in modeling is essential to success, but ORM diagrams intimidate many business people, and most would never install an ORM modeling tool on their computers. The Constellation Query Language (CQL) offers an alternative able to represent almost any ORM2 model in plain text using natural language, with the goal of supporting involvement by all parties through familiar tools including...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2010
ISSN: 1742-6596
DOI: 10.1088/1742-6596/219/4/042043