Let and be (projections on) two fuzzy relations. Let X be a sequence of k distinct fuzzy attribute names from R, and Y be a sequence of k distinct fuzzy attribute names from S, with . Then, a partial fuzzy inclusion dependency is an assertion of the form , such that the fuzzy subset-hood, where is specified in the interval [0,1] and most of the Fuzzy Values under all the attribute names in are Fuzzy Value Equivalent to some Fuzzy Values under respective attribute names in , however, the vice versa may not hold.
Published in Chapter:
Fuzzy Inclusion Dependencies in Fuzzy Databases
Awadhesh Kumar Sharma (MMM Engg College, Gorakhpur, UP, India), A. Goswami (I.I.T., Kharagpur, India), and D. K. Gupta (I.I.T., Kharagpur, India)
Copyright: © 2008
|Pages: 27
DOI: 10.4018/978-1-59904-853-6.ch026
Abstract
In this chapter, the concept of fuzzy inclusion dependencies (FIDas) in fuzzy databases is introduced and inference rules on such FIDas are derived. These FIDas may arise while putting efforts to integrate fuzzy relational databases into a fuzzy relational multidatabase. Since the concept of FIDas itself is new, no work has been done as yet for its discovery in fuzzy relational databases. Hence, an algorithm has been proposed for the discovery of FIDas that may exist between two given fuzzy relations stored in one or more fuzzy relational databases. The existence of such an FIDa will indicate that the two relations are relevant for integration during the course of integration of fuzzy databases.