Data exchange: On the complexity of answering queries with inequalities

被引：10
|
作者：
Madry, A [1 ]
机构：
[1] Univ Wroclaw, Inst Comp Sci, PL-50138 Wroclaw, Poland
来源：
INFORMATION PROCESSING LETTERS | 2005年 / 94卷 / 06期
关键词：
data exchange; query answering; certain answers; computational complexity;
D O I：
10.1016/j.ipl.2005.03.001
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
The complexity of answering Boolean queries and the local-as-view (LAV) setting, which is a special case of the general data exchange problem setting, is described. It is observed that the certain answers for queries being unions of conjunctive queries can be computed in polynomial time. There is a polynomial-time algorithm for computing the certain answers of unions of conjunctive queries with at most one inequality per disjunct. Thus the minimal number of inequalities giving rise to co-NP-hardness of this problem is at least two and six at most.
引用
收藏
页码：253 / 257
页数：5
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