Re: to_number question

From: Tanel Põder <tanel.poder.003_at_mail.ee>
Date: Thu, 15 Jul 2004 05:23:59 +0300
Message-ID: <01e301c46a12$cc172140$63a423d5@porgand>

Hm,

Maybe it has something to do how optimizer transforms your query (maybe a bug or a feature).

Try it with NO_MERGE, NO_UNNEST, NO_EXPAND, CURSOR_SHARING_EXACT hints or set some relevant parameters (_unnest_subquery=false, _complex_view_merging=false) and compare the execution plans if the behaviour changes.

Btw, in 10g there is a NO_QUERY_TRANSFORMATION hint which disables all optimizer's query transformations...

Tanel.

Original Message ----- From: <Stephen.Lee_at_DTAG.Com> To: <oracle-l_at_freelists.org> Sent: Thursday, July 15, 2004 5:00 AM Subject: RE: to_number question

>
> OK. It's something about the WHERE clause being outside the subquery.
> (Mebbe somebody can explain it.)
>
> select nbr_cc_fop_name from nbr_cc
> where nbr_cc_fop_name in ('AX','MC','VI','DS')
> and to_number(trim(nbr_cc_no_high)) - to_number(trim(nbr_cc_no_low)) > 0
>
> WORKS!
>
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Received on Wed Jul 14 2004 - 21:20:50 CDT