Enumerating answers to first-order queries over databases of low degree
Enumerating answers to first-order queries over databases of low degree
复制标题
枚举低度数据库上的一阶查询的答案
DOI:
10.1145/2594538.2594539
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Luc Segoufin
中科院分区:
文献类型:
--
作者:
Arnaud Durand;Nicole Schweikardt;Luc Segoufin
A class of relational databases has low degree if for all δ, all but finitely many databases in the class have degree at most nδ, where n is the size of the database. Typical examples are databases of bounded degree or of degree bounded by log n. It is known that over a class of databases having low degree, first-order boolean queries can be checked in pseudo-linear time, i.e. in time bounded by n1+ε, for all ε. We generalise this result by considering query evaluation.We show that counting the number of answers to a query can be done in pseudo-linear time and that enumerating the answers to a query can be done with constant delay after a pseudo-linear time preprocessing.
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DOI:
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Annual Conference for Computer Science Logic
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2013
期刊:
TOCL
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作者:
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通讯作者:
L. Segoufin