Re: [SQL] Comparing tsearch2 vectors.

[Rajesh Kumar Mallah]

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.
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=#

  

       


     

   

 


--
regds
Mallah.
Rajesh Kumar Mallah
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