摘要
目前SQL模糊扩展查询已经研究了带权重的模糊简单查询、复合查询、多表查询、子查询、全关系查询等,在一定程度上解决了查询中的模糊型问题,但对于带模糊语言量词的查询研究不多。基于Zadeh的模糊理论将模糊理论与SQL系统函数相结合,提出了一种解决含模糊语言量词的SQL查询方法,进一步丰富了SQL模糊查询体系,扩展了SQL模糊查询的应用范围,提高了查询能力。
The previous study on fuzzy queries included simple queries, compound queries, multi-relational queries, subqueries with weights and so on. It solved fuzzy questions to some extent. But it did a little to the queries with fuzzy linguistics quantifies. Based on Zadeh＇ s fuzzy theory, this paper introduced a new method to deal with such problems through the combinations of fuzzy theory and SQL functions. This will improve the SQL fuzzy queries system, thus enabling more effective queries.
出处
《计算机应用研究》
CSCD
北大核心
2008年第10期2917-2919,共3页
Application Research of Computers
基金
江苏省"六大人才高峰"高层次人才资助项目(06-A-027)
江苏省高校自然科学基金资助项目(06KJD520122)
南京信息工程大学基础研究基金重点资助项目(20070084)
关键词
模糊集理论
模糊语言量词
SQL函数
匹配度
去模糊机制
fuzzy theory
fuzzy linguistic quantifies
SQL functions
matching degree
translation system
