In this paper, we introduced fuzzy data into nested relational databases to model complex objects and imprecise and uncertain information. The fuzzy data here is extended possibility-based fuzzy data expressed by possibility distribution over a universe of discourse and meanwhile a resemblance relation on the universe is in effect. We gave the structure of fuzzy nested relational model and the approach for assessing fuzzy data redundancies. On the basis, the algebra is defined for manipulating fuzzy and complex data.
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