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Re: Comparing tsearch2 vectors.

From: Achilleus Mantzios <achill(at)matrix(dot)gatewaynet(dot)com>
To: Rajesh Kumar Mallah <mallah(at)trade-india(dot)com>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: Comparing tsearch2 vectors.
Date: 2004-07-12 13:40:38
Message-ID: Pine.LNX.4.44.0407121639410.3671-100000@matrix.gatewaynet.com (view raw or flat)
Thread:
Lists: pgsql-sql
O kyrios Rajesh Kumar Mallah egrapse stis Jul 12, 2004 :

> Achilleus Mantzios wrote:
> 
> >O kyrios Rajesh Kumar Mallah egrapse stis Jul 12, 2004 :
> >
> >  
> >
> >>Dear Mantzios,
> >>
> >>I have to get set of banners from database in
> >>response to a search term.  I want that the search term
> >>be compared to the keyword corresponding to the
> >>banners stored in database. current i am doing an
> >>equality match but i woild like to do it after stemming
> >>both the sides (serch term and  keywords).
> >>    
> >>
> >
> >You could transform your search terms so that there is the "&"
> >separator between them. (& stands for "AND").
> >E.g. "handicrafts exporter" becomes "handicrafts&exporter"
> >And then
> >select * from <your table> where idxfti @@ to_tsquery(<searchterms>);
> >  
> >
> 
> But i do not want 'handicraft exporters of delhi' to pop out if i search
> for 'handicrafts exporters' whereas
> 
> SELECT to_tsvector('handycrafts exporters of delhi') @@ to_tsquery('handycraft&exporting');
> 
> will be true.

Define what you want, and then read tsearch2 userguide.
I'm sure you'll find your way :)

> 
> Regds
> Mallah.
> 
> 
> 
> >where idxfti is your tsvector column.
> >
> >E.g.
> ># SELECT to_tsvector('handycrafts exporters') @@ to_tsquery('handycraft&exporting');
> > ?column?
> >----------
> > t
> >(1 row)
> > 
> >
> >
> >  
> >
> >>So that the banners for the adword say 'incense exporter' is
> >>shown even if 'incenses exporter' or  'incense exporters' is
> >>searched.
> >>
> >>I hope i am able to clarify.
> >>
> >>Regds
> >>Mallah.
> >>
> >>Achilleus Mantzios wrote:
> >>
> >>    
> >>
> >>>O kyrios Rajesh Kumar Mallah egrapse stis Jul 12, 2004 :
> >>>
> >>> 
> >>>
> >>>      
> >>>
> >>>>Hi,
> >>>>
> >>>>We want to compare strings after stemming. Can anyone
> >>>>tell me what is the best method. I was thinking to compare
> >>>>the tsvector ,but there is no operator for that.
> >>>>   
> >>>>
> >>>>        
> >>>>
> >>>I'd tokenize each string and then apply lexize() to get the 
> >>>equivalent stemified 
> >>>word, but what exactly are you trying to accomplish?
> >>>
> >>> 
> >>>
> >>>      
> >>>
> >>>>Regds
> >>>>Mallah.
> >>>>
> >>>>
> >>>>
> >>>>tradein_clients=# SELECT to_tsvector('handicraft exporters');
> >>>>+---------------------------+
> >>>>|        to_tsvector        |
> >>>>+---------------------------+
> >>>>| 'export':2 'handicraft':1 |
> >>>>+---------------------------+
> >>>>(1 row)
> >>>>
> >>>>Time: 710.315 ms
> >>>>tradein_clients=#
> >>>>tradein_clients=# SELECT to_tsvector('handicrafts exporter');
> >>>>+---------------------------+
> >>>>|        to_tsvector        |
> >>>>+---------------------------+
> >>>>| 'export':2 'handicraft':1 |
> >>>>+---------------------------+
> >>>>(1 row)
> >>>>
> >>>>Time: 400.679 ms
> >>>>tradein_clients=# SELECT to_tsvector('Hi there') = to_tsvector('Hi there');
> >>>>ERROR:  operator does not exist: tsvector = tsvector
> >>>>HINT:  No operator matches the given name and argument type(s). You may 
> >>>>need to add explicit type casts.
> >>>>tradein_clients=#
> >>>>
> >>>>
> >>>>   
> >>>>
> >>>>        
> >>>>
> >>> 
> >>>
> >>>      
> >>>
> >>
> >>    
> >>
> >
> >  
> >
> 
> 
> 

-- 
-Achilleus


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Subject: Re: Comparing tsearch2 vectors.
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