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ACM Transactions on Database Systems (TODS), Volume 23 Issue 1, March 1998

Supporting valid-time indeterminacy
Curtis E. Dyreson, Richard Thomas Snodgrass
Pages: 1-57
DOI: 10.1145/288086.288087
In valid-time indeterminacy it is known that an event stored in a database did in fact occur, but it is not known exactly when. In this paper we extend the SQL data model and query language to support valid-time...

Safe query languages for constraint databases
Peter Z. Revesz
Pages: 58-99
DOI: 10.1145/288086.288088
In the database framework of Kanellakis et al. [1990] it was argued that constraint query languages should take constraint databases as input and give other constraint databases that use the same type of atomic constraints as output. This...

Safe stratified Datalog with integer order does not have syntax
Alexei P. Stolboushkin, Michael A. Taitslin
Pages: 100-109
DOI: 10.1145/288086.288089
Stratified Datalog with integer (gap)-order (or Datalog ¬,<z ) is considered. A Datalog...