From: gherzig@fmed.uba.ar
To: pgsql-sql@postgresql.org
Subject: Re: best index for ~ ordering?
Date: Wed, 7 Mar 2007 00:28:57 -0300 (ART)
Message-ID: <22296.190.55.118.199.1173238137.squirrel@www.webmail.fmed.uba.ar> (raw)
In-Reply-To: <20070306222802.GA16606@phlogiston.dyndns.org>
References: <45EDDE5F.2030303@fmed.uba.ar>
<20070306222802.GA16606@phlogiston.dyndns.org>
Well, im wondering if is possible using LIKE '%blah%', even better would be
upper/lower(string) like '%blah%',
Im not at work right now, i will try it latter and makes you know about
the results of using tsearch indexing.
Thanks a lot, man!
Gerardo
> On Tue, Mar 06, 2007 at 06:34:23PM -0300, Gerardo Herzig wrote:
>> Hi all, i have a large table with one varchar field, and im triyng to
>> get information about what index should i use in order to using that
>> index (if this is possible) for ~ searching, and/or using LIKE
>> searching.
>
> What sort of match are you doing? If you're doing left-anchored
> searches (LIKE 'blah%') then your standard btree is good. If you're
> doing unanchored searches (LIKE '%blah%' or similar) you're best doing
> tsearch. If it's right-anchored, you can do an index on the reverse
> of the string.
>
> A
>
> --
> Andrew Sullivan | ajs@crankycanuck.ca
> Unfortunately reformatting the Internet is a little more painful
> than reformatting your hard drive when it gets out of whack.
> --Scott Morris
>
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--
Gerardo Herzig
Direccion General de Organizacion y Sistemas
Facultad de Medicina
U.B.A.
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To: pgsql-sql@postgresql.org
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Subject: Re: best index for ~ ordering?
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