Date Added: Dec 2010
Efficient handling of inexact (grey) information is an important issue for the new emerging database technology. Inexact or imprecise information has been represented and manipulated by using different techniques, including fuzzy set theory, possibility theory, IVF (Interval Valued Fuzzy) Sets, Time Petri Nets, Fuzzy Clouds, etc. In this paper, different approaches dealing with uncertainty have been introduced. A brief description of uncertainty in object oriented databases has been discussed, also. Object oriented databases are considered better than the relational and other databases, due to increasing demand of new approaches to deal with complex data and complex relationships existing among such data and large data intensive applications.