为什么SQL全文索引不能返回包含＃的单词的结果？ [英] Why doesn't SQL Full Text Indexing return results for words containing #?

问题描述

例如，我的查询就像下面的SQL Server 2005一样：

  SELECT * FROM表WHERE FREETEXT（SearchField， 'c＃'）
  

我有一个全文索引定义为使用SearchField列，它在使用时返回结果：

  SELECT * FROM表WHERE SearchField LIKE'％c＃％'
  

我相信＃是一个特殊字母，那么如何让FREETEXT正确地用于上面的查询？

＃char被标记为标点符号，因此被忽略，所以看起来我们将从字词索引忽略列表中删除字母C.

在完成之后在本地进行测试并重建索引并获得结果！

考虑在索引列上使用不同的断词语言，所以这些特殊字符不会被忽略。编辑：我还发现这个信息：

c＃被索引为c（如果c不在您的噪声字列表中，稍后会在噪声字列表中查看更多信息），但C＃被索引为C＃无论C或c在您的噪音词列表中，无论在Win2003上运行SQL 2000）。不仅C＃存储为C＃，而且任何大写字母后跟＃。相反，c ++（和任何其他小写字母后跟一个++）的索引为c（无论c是否在您的噪音词列表中）。

For instance, my query is like the following using SQL Server 2005:

SELECT * FROM Table WHERE FREETEXT(SearchField, 'c#') 

I have a full text index defined to use the column SearchField which returns results when using:

SELECT * FROM Table WHERE SearchField LIKE '%c#%'

I believe # is a special letter, so how do I allow FREETEXT to work correctly for the query above?

解决方案

The # char is indexed as punctuation and therefore ignored, so it looks like we'll remove the letter C from our word indexing ignore lists.

Tested it locally after doing that and rebuilding the indexes and I get results!

Looking at using a different word breaker language on the indexed column, so that those special characters aren't ignored.

EDIT: I also found this information:

c# is indexed as c (if c is not in your noise word list, see more on noise word lists later), but C# is indexed as C# (in SQL 2005 and SQL 2000 running on Win2003 regardless if C or c is in your noise word list). It is not only C# that is stored as C#, but any capital letter followed by #. Conversely, c++ ( and any other lower-cased letter followed by a ++) is indexed as c (regardless of whether c is in your noise word list).

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