This paper deals with two ways to manage aggregate queries: materialized view and approximate query, concludes the processing methods of each way and presents future research directions.
讨论了目前聚集查询处理的两种方法，即实化视图和近似查询，总结了国内外对其研究现状，并对未来的研究方向提出看法。
Sliding window is often used as a sampling method for query processing and obtaining approximate answers over data stream.
滑动窗口是对数据流进行连续查询处理、得出近似查询结果的一种常用的数据采样技术。
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