基于扩展SQL的GIS模糊查询的表达与实现
The Representation and Implementation ofFuzzy Query Based on Extended SQL
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摘要: 模糊查询通常包含模糊单词和3种算子——语气算子、模糊化算子和判定化算子。通过模糊集合论,可表示这些模糊概念。在此基础上,介绍了一种扩展SQL表达模糊查询,并将其转化为标准SQL加以实现的方法。Abstract: Fuzzy querg usually includes fuzzy words and three kinds of modifiers:linguistic, fuzzy as well as deterministic modifier.All these can be described with fuzzy set theory.To this end,this paper presents an approach for representing fuzzy query via Extended SQL(ESQL),which is then implemented by being transferred into standard SQL.
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