On Fri, 7 Mar 2008, b wragg wrote:
Hi all,
I'm running the following query to match a supplied text string to an actual
place name which is recorded in a table with extra info like coordinates,
etc.
SELECT ts_rank_cd(textsearchable_index_col , query, 32 /* rank/(rank+1) */)
AS rank,*
FROM gazetteer, to_tsquery('Gunbower|Island|Vic') query
WHERE query @@ textsearchable_index_col order by rank desc, concise_ga desc,
auda_alloc desc LIMIT 10
When I run this I get the following top two results:
Pos Rank Name
State
1 0.23769 Gunbower Island Primary School Vic
2 0.23769 Gunbower Island Vic
The textsearchable_index_col for each of these looks like this:
'vic':6 '9999':5 'gunbow':1 'island':2 'school':4 'primari':3 'victoria':7
'vic':4 '9999':3 'gunbow':1 'island':2 'victoria':5
I'm new to this, but I can't figure out why the "Gunbower Island Primary
School" is getting top place. How do I get the query to improve the ranking
so that an exact match (like "Gunbower|Island|Vic") gets a higher position?
you can read documentation and use document length normalization flag,
or write your own ranking function.
Thanks,
bw
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Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@xxxxxxxxxx, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
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