In database theory, query containment problem for conjunctive queries of constraint relational model has been resolved. 在数据库理论方面,约束关系模型的不等式合取查询包含(QC)问题已经得到解决。
Query containment is a fundamental algorithmic problem in database optimization. 查询包含(QC)问题是查询优化的基本算法问题。
This paper first narrates the characteristic of mobile agent and the rules of query containment and merging, then, based on it, proposes a query transaction strategy. 介绍了移动Agent技术的特点,查询包含(QC)与归并的思想,并在此基础上提出了基于移动Agent的查询处理策略。
The Research on Index of XML Supporting Structural Query and Containment Operation 支持结构查询和包含操作的XML索引研究
As virtual database uses relational data model, the paper makes a special effort to discuss query rewriting technology - rewriting queries using views and its conjunctive query, containment mapping under this model. 基于虚拟数据库所采用的关系数据模型,着重探讨了该模型下的查询重写技术&利用视图重写查询以及基于其上的合取查询、包含映射等问题。