标记和检查:单定义查询的数据访问

S. Rudolph, M. Krötzsch
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引用次数: 46

摘要

我们介绍单行定义查询(modeq)和嵌套单行定义查询(nemodeq),这两种查询形式扩展了连接查询、连接双向正则路径查询和单行Datalog查询。两者都可以表示为Datalog查询和一元二阶逻辑,但它们具有可判定的查询包含问题和有利的查询应答复杂性:数据复杂性为P,组合复杂性为NP (MODEQs)和PSpace (NEMODEQs)。我们证明(NE)MODEQ回答在一个众所周知的元组生成依赖的通用类的存在下仍然是可决定的。此外,还介绍了将依赖项下的查询重写为(NE)模型的技术。重写可以部分应用,如果tgd的不可重写部分允许基于其他理由的可决定(NE)MODEQ回答,则(NE)MODEQ回答仍然是可决定的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flag & check: data access with monadically defined queries
We introduce monadically defined queries (MODEQs) and nested monadically defined queries (NEMODEQs), two querying formalisms that extend conjunctive queries, conjunctive two-way regular path queries, and monadic Datalog queries. Both can be expressed as Datalog queries and in monadic second-order logic, yet they have a decidable query containment problem and favorable query answering complexities: a data complexity of P, and a combined complexity of NP (MODEQs) and PSpace (NEMODEQs). We show that (NE)MODEQ answering remains decidable in the presence of a well-known generic class of tuple-generating dependencies. In addition, techniques to rewrite queries under dependencies into (NE)MODEQs are introduced. Rewriting can be applied partially, and (NE)MODEQ answering is still decidable if the non-rewritable part of the TGDs permits decidable (NE)MODEQ answering on other grounds.
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CiteScore
4.40
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