Re: function index for like '%string%'

Suzy,

You haven't detailed how you are search for a part of the email address.

Is it random? Or is it on a definable piece of the address such as the domain name?

If so, then why not use a trigger to break the email address down into it's separate components store them in separate columns?

If not, then you probably need to consider Intermedia, which has already been suggested.

Jared

On Friday 01 June 2001 22:15, SuzyV wrote:
> How unpleasant, the answer I expected but didn't want to hear. At points
> of loopy desperation I've tried dumbest things to make this work, eg.,
> creating the index as lower('%email_addy%') which produces the expected
> useless result in dba_ind_expressions:
>
> SQL> create index idx_test
> on test (lower('%email_addy%') ;
>
> SQL> select index_name, column_expression from dba_ind_expressions
> where table_name = 'TEST'
>
> INDEX_NAME COLUMN_EXPRESSION
> ---------- -----------------
> IDX_TEST '%email_addy%'
>
>
> My suggested workaround to the developers is to store the string lower
> case. For some strings this is okay, but obviously not a great solution for
> strings which may be case-dependent.
>
> fbi = f**ing boneheaded index :)
>
> Suzy
>
> "Joseph S. Testa" wrote:
> > 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
> > > >
> > > >Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
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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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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Jared Still
  INET: jkstill_at_cybcon.com

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