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- W59761017 abstract "This chapter deals with flexible queries addressed to regular relational databases where conditions are defined by fuzzy sets. A particular type of fuzzy conditions is investigated, where two aggregates applying to fuzzy sets are compared. The chapter proposes a sound interpretation for such statements in the context of flexible querying, that is, such that a degree of satisfaction is obtained. As a consequence, the set of answers returned to the user is discriminated from the best answers to less satisfactory ones. Many approaches to define flexible querying have been proposed in the last decades and it has been shown that fuzzy set theory provides a unifying framework to define flexible queries. In such a framework, fuzzy sets and a given condition lead to a degree of satisfaction. So far, conditions calling on aggregate functions (count, sum, max, min, and avg) were restricted to regular sets and this chapter examines the situation where aggregates may apply to fuzzy sets. In order to be coherent with the considered context, the interpretation of such a condition must be a unique degree of fulfillment." @default.
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- W59761017 date "2003-01-01" @default.
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- W59761017 title "On the comparison of aggregates over fuzzy sets" @default.
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- W59761017 doi "https://doi.org/10.1016/b978-044451379-3/50011-x" @default.
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