منابع مشابه
Experience Using TSQL2 in a Natural Language Interface
Attempting to use Tsql2 in a natural language interface for temporal databases has focused our attention on certain points in the semantics of Tsql2 where we believe that clariications or modiications are needed. It has also led us to some extensions to Tsql2 that seem generally useful, regardless of natural language issues.
متن کاملT-SPARQL: A TSQL2-like Temporal Query Language for RDF
In this paper, we present a temporal extension of the SPARQL query language for RDF graphs. The new language is based on a temporal RDF database model employing triple timestamping with temporal elements, which best preserves the scalability property enjoyed by triple storage technologies, especially in a multi-temporal setting. The proposed SPARQL extensions are aimed at embedding several feat...
متن کاملThe TSQL2 Data Model
Adding time to the relational model has been a daunting task [1, 2, 3, 4]. More than two dozen time-extended relational data models have been proposed over the last fifteen years [5]. Most of these are valid-time models. Each fact in a validtime relation has associated the time when it is true in the modeled reality. Other models support transaction-time relations where each fact has associated...
متن کاملAn Algebra for TSQL2
TSQL2 is a declarative query language, and as such, requires a procedural (algebraic) equivalent for implementation. In this chapter, we describe such an algebraic language. We undertook this design in order to show that TSQL2 can be implemented efficiently, with minimal extension of existing techniques. As TSQL2 provides a consistent extension of SQL-92, we had a parallel goal in the construct...
متن کاملEvaluating the Completeness of TSQL2
The question of what is a well-designed temporal data model and query language is a difficult, but also an important one. The consensus temporal query language TSQL2 attempts to take advantage of the accumulated knowledge gained from designing and studying many of the earlier models and languages. In this sense, TSQL2 represents a constructive answer to this question. Others have provided analy...
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ژورنال
عنوان ژورنال: ACM SIGMOD Record
سال: 1994
ISSN: 0163-5808
DOI: 10.1145/181550.181562