摘要： 讨论了时态数据库处理不明确时间存在的一些问题,并给出描述不明确时间间隔的表示方法。在此基础上给出了各种时态运算的扩展,丰富了时态数据库的适应性。

关键词: 时态数据库, 不明确时间间隔, 时态运算

Abstract: This paper discusses the problem of handling time impreciseness in temporal database and presents models for the representation of imprecise time intervals. On this base, it also presents the extensions of various operations of temporal database .The models and extenstions discussed in this paper enrich the flexibility of temporal database . ;;

中图分类号: 

• TP311.52