Home Database Mysql Tutorial sqlserver 2005 关于全文索引中使用同义词库

sqlserver 2005 关于全文索引中使用同义词库

Jun 07, 2016 pm 03:07 PM
sqlserver use about index

同义词 库 XML ID="Microsoft Search Thesaurus" thesaurus xmlns="x-schema:tsSchema.xml" diacritics_sensitive0/diacritics_sensitive expansion sub@keyword1/sub sub@keyword2/sub /expansion expansion sub每日任务是什么?/sub submeirirenwu/sub /ex

同义词

 

   
 0
       
            @keyword1
            @keyword2
       

       
            每日任务是什么?
            meirirenwu
       

   

 

select * from freetexttable(tablename,column1,@keyword1)

select * from freetexttable(tablename,column1,@keyword2)

 

产生的结果集个数相同,但两者产生的rank没有可比性

 

以下粘贴子连接文档中有关同义词以及排名(rank)的信息

1.系统将通过同义词库对 freetext_string 字符串进行断字处理、词干分析,然后执行同义词库查询。

2.FREETEXT 查询将通过派生词(原始查询词的变形)向查询中添加词,这些词将被作为单独的、与派生出它们的词没有特殊联系的词来处理。同义词库功能派生出的同义词将被当作单独的、具有同等加权值的词来处理。查询中的每个词都会对排名产生影响。

 

 

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