聚集查询 meaning in English
aggregated query
Examples
- Based on randomizing techniques , this paper discussed how the sketch - based approach estimates approximate answers to aggregate queries
摘要讨论了基于草图的复杂聚集查询的近似处理算法。 - How to continuously query on the continuous data streams is an important research direction in the data stream theories
如何在连续快速的数据流上进行聚集查询成为数据流理论中一个重要的研究方向。 - Hierprefixcube retains advantages on computation and organization of prefixcube , and it can directly support aggregate queries on levels of the dimension hierarchy
它不仅保留了前缀立方在计算和组织结构上的优点，又能直接和充分支持维层次级的聚集查询。 - According to the theory mentioned above , a new data stream management system jasper which extends the sql and forms a new continuous query language jaspercq is developed . jaspercq not only supports the continuous query , but also supplies the approximate query and predictive aggregate query
根据上述理论,开发了一个名为jasper的数据流管理原型系统,对sql语言进行了扩充形成了可以支持连续查询、近似查询以及预测聚集查询语义的流式查询语言jaspercq 。 - Second , the issue of approximate aggregation query on the data streams is discussed . meanwhile , the approximate query theories based on the histogram synopsis is proposed , and the autosuited histogram synopsis method and the histogram synopsis synchronization method are provided . third , the problem of predictive aggregate queries on the continuous data streams is researched , and a new predictive aggregate query method based on basic window synopsis and predictive equation is given
本文围绕连续数据流上的聚集查询展开讨论,首先针对数据流上的精确聚集查询问题,提出3种改进的基于滑动窗口的精确聚集查询算法,这三种算法可以在消耗很少内存的情况下提供高效准确的查询结果;其次讨论了连续数据流上的近似聚集查询问题,给出了基于数据流滑动窗口的直方图大纲理论,并提出了适用于滑动窗口的自适应直方图大纲生成算法和大纲同步策略;最后讨论了连续数据流上的预测聚集查询问题,提出了一种基于基本窗口及预测方程方法的预测聚集查询算法。