Uncertainty in deductive databases and logic programming has been modeled using a variety of (numeric and non-numeric) formalisms in the past, including probabilistic, possibilistic, and fuzzy set-theoretic approaches, and many valued logic programming. In this paper, we consider a hybrid approach to the modeling of uncertainty in deductive databases.
DEDUCTIVE DATABASES LOGIC PROGRAMMING UNCERTAIN INFORMATION KNOWLEDGE-BASE SYSTEMS QUERY OPTIMIZATION CONTAINMENT AND EQUIVALENCE TIME COMPLEXITY