Aggregate Queries on Sparse Databases
Aggregate Queries on Sparse Databases
复制标题
稀疏数据库上的聚合查询
DOI:
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发表时间:
2019
期刊:
影响因子:
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通讯作者:
Szymon Toruńczyk
中科院分区:
文献类型:
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作者:
Szymon Toruńczyk
We propose an algebraic framework for studying efficient algorithms for query evaluation, aggregation, enumeration, and maintenance under updates, on sparse databases. Our framework allows to treat those problems in a unified way, by considering various semirings, depending on the considered problem. As a concrete application, we propose a powerful query language extending first-order logic by aggregation in multiple semirings. We obtain an optimal algorithm for computing the answers of such queries on sparse databases. More precisely, given a database from a fixed class with bounded expansion, the algorithm computes in linear timea data structure which allows to enumerate the set of answers to the query, with constant delay between two outputs.
DOI:
10.1145/3232056
发表时间:
2017
期刊:
ACM Transactions on Database Systems (TODS)
影响因子:
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作者:
Christoph Berkholz;Jens Keppeler;Nicole Schweikardt
通讯作者:
Nicole Schweikardt
DOI:
10.1145/3196959.3196971
发表时间:
2018
期刊:
Proceedings of the 37th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems
影响因子:
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作者:
Nicole Schweikardt;Luc Segoufin;Alexandre Vigny
通讯作者:
Alexandre Vigny