منابع مشابه
TVQL - Temporal Versioned Query Language
The Temporal Versions Model (TVM) is an Object Oriented Data Model developed to store the object versions and, for each version, the history of its dynamic attributes and relationships values. In this work, we propose a query language for this model. The language, called Temporal Versioned Query Language TVQL, is based on SQL, adding new features to recover temporal information and versions. An...
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This paper addresses the issue of visual query formulation for temporal databases. We introduce a number of visual constructs that allow users to build queries in a modular, bottom{up fashion based on a temporal Extended Entity{Relationship Model. These constructs are: Temporal projection, temporal selection, time links, ltering and set operators, and temporal aggregates. This paper also identi...
متن کاملTemporal Logic in Database Query Languages
DEFINITION The term “temporal logic” is used, in the area of formal logic, to describe systems for representing and reasoning about propositions and predicates whose truth depends on time. These systems are developed around a set of temporal connectives, such as sometime in the future or until, that provide implicit references to time instants. First-order temporal logic is a variant of tempora...
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In this paper, we introduce the concept “team” and incorporate the team query into data language SQL. Existing relational query languages use tuple variables of tables to specify required data. Queries that are expressed by these languages are used to get all the data which satisfy the specified conditions. While a team variable represents a subset of a table, a team query is to retrieve all th...
متن کاملcql - A Flat File Database Query Language
cql is a UNIX system tool that applies C style query expressions to flat file databases. In some respects it is yet another addition to the toolbox of programmable file filters: grep [Hume88], sh [Bour78][BK89], awk [AKW88], and perl [Wall]. However, by restricting its problem domain, cql takes advantage of optimizations not available to these more general purpose tools. This paper describes t...
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ژورنال
عنوان ژورنال: Science and Modernity
سال: 2014
ISSN: 2411-2127
DOI: 10.17117/ns.2014.02.060