Reformulating Aggregate Queries Using Views

Reformulating Aggregate Queries Using Views
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使用视图重新制定聚合查询

DOI:
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发表时间:
2013
期刊:
Symposium on Abstraction, Reformulation and Approximation
影响因子:
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通讯作者:
M. Genesereth
M. Genesereth
中科院分区:
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文献类型:
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作者:
Abhijeet Mohapatra;M. Genesereth

文献摘要

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我们提出了一种算法,可以使用数据集成 LAV 设置中的视图重新制定聚合查询。我们的算法考虑了重构的特殊情况,其中查询中的聚合被表示为视图定义中聚合的视图。尽管确定两个查询是否等效的问题是不可判定的,但如果存在,我们的算法会返回等效重写。
We propose an algorithm to reformulate aggregate queries using views in a data integration LAV setting. Our algorithm considers a special case of reformulations where aggregates in the query are expressed as views over aggregates in the view definitions. Although the problem of determining whether two queries are equivalent is undecidable, our algorithm returns an equivalent rewriting if one exists.