Re: function index for like '%string%'

The query allows a user to search for any token within an e-mail address:

select current_email from auth_users
where lower(current_mail) like nls_lower('%string%') ;

Where string could be '%user%' '%user_at_host.domain%' '%_at_domain%', '%_at_host%' etc...

Which leads me to another question: the developer feels all user input searches should use nls_ functions. I'm missing the point, we aren't doing locale-specific searches so why nls_ functions?

Jared Still wrote:
>
> 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
> > > > >San Diego, California -- Public Internet access / Mailing Lists
> > > > >--------------------------------------------------------------------
> > > > >To REMOVE yourself from this mailing list, send an E-Mail message
> > > > >to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> > > > >the message BODY, include a line containing: UNSUB ORACLE-L
> > > > >(or the name of mailing list you want to be removed from). You may
> > > > >also send the HELP command for other information (like subscribing).
> > > > >--
> > > > >Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > >
> > > --
> > > 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
> > >
> > > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> > > San Diego, California -- Public Internet access / Mailing Lists
> > > --------------------------------------------------------------------
> > > To REMOVE yourself from this mailing list, send an E-Mail message
> > > to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
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> > > also send the HELP command for other information (like subscribing).
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Jared Still
> INET: jkstill_at_cybcon.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
> --------------------------------------------------------------------
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> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
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-- 
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
San Diego, California        -- Public Internet access / Mailing Lists
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also send the HELP command for other information (like subscribing).