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Re: function index for like '%string%'

From: Joseph S. Testa <teci_at_the-testas.net>
Date: Fri, 01 Jun 2001 18:30:41 -0700
Message-ID: <F001.00319066.20010601183528@fatcity.com>

i spent about a week about 6 months ago looking for something to fill that possibility to no avail.

joe
Rachel Carmichael wrote:
>
> she knows why it isn't being used. What Suzy wants to know (and I do too,
> because I have a similar situation) is if there is a way to create an index
> that will let you search with the like clause.
>
> Unfortunately my gut instinct is that you can't make Oracle do that
>
> >From: "Hillman, Alex" <Alex.Hillman_at_usmint.treas.gov>
> >Reply-To: ORACLE-L_at_fatcity.com
> >To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> >Subject: RE: function index for like '%string%'
> >Date: Fri, 01 Jun 2001 14:11:08 -0800
> >
> >index is not used because you have leading % in the like predicate.
> >
> >Alex Hillman
> >
> >-----Original Message-----
> >Sent: Friday, June 01, 2001 5:09 PM
> >To: Multiple recipients of list ORACLE-L
> >
> >
> >
> >I've created a function index for lower(column_name). However the query
> >does
> >a like comparison rather than equality so the index isn't used. Is there a
> >way to create a function index for this?
> >
> >Here's the index and query:
> >
> >create index fx1_auth_users
> >on auth_users (lower(current_email)
> >tablespace app01_midx ;
> >
> >select current_email from auth_users
> >where lower(current_email) like '%datsit.com%' ;
> >
> >Thanks much,
> >Suzy
> >--
> >Please see the official ORACLE-L FAQ: http://www.orafaq.com
> >--
> >Author: Suzy Vordos
> > INET: lvordos_at_datsit.com
> >
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-- 
Joe Testa  http://www.oracle-dba.com
Performing Remote DBA Services, need some backup DBA support?
For Sale: Oracle-dba.com domain, its not going cheap but feel free to
ask :)
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Joseph S. Testa
  INET: teci_at_the-testas.net

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Received on Fri Jun 01 2001 - 20:30:41 CDT

Original text of this message

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