%0 Journal Article
%T Extended fuzzy grouping queries in relational databases and derivation rules<br>关系数据库中分组查询的模糊扩展及去模糊机制
%A CHEN Yi-fei
%A ZHANG Ying-chao
%A YE Xiao-ling
%A <br>陈逸菲
%A 张颖超
%A 叶小岭
%J 计算机应用
%D 2008
%I 
%X There are few researches on fuzzy queries of relational databases involving the fuzzy conditions or relative linguistic quantifiers in "having" clause. Methods based on fuzzy set theory to these queries were presented here. The fuzzy conditions in "having" clause were translated to general SQL queries on the basis of-cut of membership function. Therefore, the tuples can be filtered by the RDBMS, which improves the efficiency of fuzzy queries. Nonfuzzy cardinality of fuzzy set was used to evaluate the quantified "having" clause, so the computation and the result became simple.
%K fuzzy queries
%K fuzzy set
%K cardinality
%K grouping queries<br>模糊查询
%K 模糊集合
%K 基数
%K 分组查询
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=831E194C147C78FAAFCC50BC7ADD1732&aid=2D6BC37088888C9B2A91A7A8431BA6BD&yid=67289AFF6305E306&vid=D3E34374A0D77D7F&iid=94C357A881DFC066&sid=A60ED5C9472B8BEB&eid=4206C58D935377EA&journal_id=1001-9081&journal_name=计算机应用&referenced_num=0&reference_num=6