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From "Lixin Meng" <li...@fulldegree.com>
Subject RE: usage of prohibit operator '-'
Date Thu, 17 Apr 2003 18:39:52 GMT
Thanks. That helps.

Lixin

-----Original Message-----
From: Scott Ganyo [mailto:scott.ganyo@etapestry.com]
Sent: Thursday, April 17, 2003 11:35 AM
To: Lucene Users List
Subject: Re: usage of prohibit operator '-'


Lucene only searches for positive results, not negative.  If you think
of the "-" operator as a subtraction, then you'll understand that Lucene
requires that you also select something to subtract from.

Scott

Lixin Meng wrote:

>I am having some problems with the probhibit operator '-'. If anyone can
>shed some light on it, I certainly appreciate it.
>
>In the index, I have a field with field name 'ID'. It tried query like:
>
>	ID:(+ID10)
>or
>	ID:(+"ID10")
>
>It will returns some hits.
>
>However, if I try
>
>	ID:(-ID10)
>or
>	ID:(-"ID10")
>
>I got an empty result set, which should have some records.
>
>Any idea how to use this prohibit operator?
>
>Regards,
>Lixin
>
>
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deserve neither liberty nor safety." - Benjamin Franklin



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