【摘要】 管理信息系统中时态数据是普遍存在的,然而关系数据库(RDB)不具备时态数据管理能力.为此分析了信息系统中时间的表示和推理以及不同数据库表现时态数据能力的差异.基于时态数据管理理论提出了时变表、常量表、瞬像表的概念.在此基础上以时态关系模型为例分析了时态数据向关系数据转换的方法,从而实现了时态数据的关系数据管理.更多还原

【Abstract】 There are a great many temporal data in the MIS.However,the Relationship Data\|Base(RDB) doesn’t have any ability to deal with it. The expression and ratiocination of time and the difference to express temporal data between several databases are analyzed. Based on the theory of temporal data management, the concept of temporal table,flat table and snap table are developed. Depending on the temporal\|relationship model, the method to turn the temporal data to the relationship data is analysed.更多还原