Bipolar Querying of Valid-Time Intervals Subject to Uncertainty
Databases model parts of reality by containing data representing properties of real-world objects or concepts. Often, some of these properties are time-related. Thus, databases often contain data representing time-related information. However, as they may be produced by humans, such data or information may contain imperfections like uncertainties. An important purpose of databases is to allow their data to be queried, to allow access to the information these data represent. Users may do this using queries, in which they describe their preferences concerning the data they are (not) interested in. Because users may have both positive and negative such preferences, they may want to query databases in a bipolar way. Such preferences may also have a temporal nature, but, traditionally, temporal query conditions are handled specifically. In this paper, a novel technique is presented to query a valid-time relation containing uncertain valid-time data in a bipolar way, which allows the query to have a single bipolar temporal query condition.
KeywordsBipolar Querying Valid-time Relation Valid Time Temporal Databases Uncertainty Possibility Theory Ill-known Intervals
Unable to display preview. Download preview PDF.
- 8.Zadrozny, S., De Tré, G., De Caluwe, R., Kacprzyk, J.: An overview of fuzzy approaches to flexible database querying. In: Handbook of Research on Fuzzy Information Processing in Databases. IGI Global (2008)Google Scholar
- 14.Galindo, J., Medina, J.M.: FTSQL2: Fuzzy Time in Relational Databases*. In: Proceedings of the 2nd International Conference in Fuzzy Logic and Technology, pp. 47–50 (2001)Google Scholar
- 17.Pons, J.E., Bronselaer, A., De Tré, G., Pons, O.: Possibilistic evaluation of sets. International Journal of Uncertainty. Fuzziness and Knowledge-Based Systems (2012); Accepted for publication in the International Journal of Uncertainty, Fuzziness and Knowledge-Based SystemsGoogle Scholar
- 19.Dubois, D., Prade, H.: Possibility Theory. Plenum Press (1988)Google Scholar