微机关系数据库的递归查询接口  

Recursive Query Interface for a Microcomputer Relational Database System

作　　者：王家华[1] 金祥意[1] 张宏霞 姚天顺[1] 

机构地区：[1]东北大学信息科学与工程学院

出　　处：《控制与决策》1998年第2期173-176,172,共5页Control and Decision

摘　　要：为满足大型企业中产品零部件数据管理的需要，解决关系数据库所不能解决的递归查询问题，为微机关系数据库设计并实现了一个递归查询接口。该接口能够计算Ｄａｔａｌｏｇ逻辑程序，通过允许规则头部包含函数符号，使规则增加了数值计算能力。The interface is implemented in order to meet the requirements of data management in a large scale enterprise. It can compute the extended Datalog programs without too much complexity added. The heads of rules may contain function symbols. The rules can not only be used to reason but also to process numeric calculation. The semi-naive algorithm was improved. A new convergent condition of the algorighm was presented to allow legal duplicate tuples to occur in result relations.

关 键 词：关系数据库 递归查询接口 微机 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]