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DB 2 Net Search Extender提供了一种灵活的查询语言，可以根据复杂的获取操作(例如涉及布尔组合、通配符和模糊搜索)寻找相关信息。
DB2 Net search Extender provides a flexible query language to find relevant information based on complex retrieval operations involving Boolean combination, wildcard, and fuzzy search, for example.
考虑到传统查询只能处理精确的数据，使得这种查询不能应用于自然语言中的模糊概念。
Conventional queries can only deal with exact data, and cann't be applicable to fuzzy concepts.
SQL语言对数据库的精确查询表现出较佳的性能，但模糊查询却不太令人满意。
SQL shows a fine performance in database for exact queries, but not for fuzzy queries.
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