SDB
1995
14 years 3 months ago
1995
SDB
1995
14 years 3 months ago
1995
Most of work on partial information in databases asks which operations of standard languages, like relational algebra, can still be performed correctly in the presence of nulls. In...
SDB
1995
14 years 3 months ago
1995
In this paper we discuss two data models for spatial database systems: the linear data model and the topological data model. Both can be used to model a wide range of applications....
SDB
1995
14 years 3 months ago
1995
Database transformations arise in many di erent settings including database integration, evolution of database systems, and implementing user views and data-entry tools. This paper...