Re: [SQL] Select like when searching for whole word and optimizing it

I use regex '( |^)io([^A-z]|$)' to find word 'io'
For example
select a.msg_id,b.key_id
from publications a, keywords b where a.title ~* ('( |^)'||b.name||'([^A-z]|$)')
and b.key_id in ( select key_id from keywords);
This match word (b.name) in most cases.

Regards,
Oleg

On Wed, 9 Jun 1999, Michal Samek wrote:

> Date: Wed, 09 Jun 1999 10:41:02 +0200
> From: Michal Samek <webmaster(at)tony(dot)cz>
> To: pgsql-sql <pgsql-sql(at)postgreSQL(dot)org>
> Subject: [SQL] Select like when searching for whole word and optimizing it
>
> In my e-shop I'm using the searching based on select like command;
> something like
> SELECT * FROM kat WHERE name LIKE '%some_text%';
> and when searching for the whole word:
> SELECT * FROM kat WHERE name LIKE '% some_text %';
> For this is necessary to maintain the name column with one space added
> before and after the name column value (to match starting and ending
> words). It's working but very ugly.
>
> Maybe there is some better way to search for the whole word?
>
> And another question, is there some way to optimize the SELECT LIKE
> querry? I know that when I send something like "SELECT * FROM kat WHERE
> name LIKE 'blabla%';" postgresql uses the index but not when the search
> string begins with '%'... My table is quickly growing and now I can feel
> the speed of my web is impacted a lot.
>
> There is a lot of same values in the name field (for ex. 'QUEEN' about
> 40 times etc.) - I could make a table with unique only name values and
> point to them from the main table kat. Will the searching be more
> effective then?
>
> Thanks for any help; I hope it's interesting not only for me :)
> --
> Michal Samek, Tony distribuce s.r.o.
> webmaster(at)tony(dot)cz (++420659/321350)
> ICQ: 38607210
>

_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83