Re: SQL Tunning
- From: Wes Brooks <wes_brooks@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Tue, 3 Aug 2004 08:54:24 -0700 (PDT)
Hello expert,
Thank you very much for all of your reply.
But in my case, the 1 is variable. I tried the following but it complains that
SELECT TRUNC(SYSDATE)-22/86400 from dual;
TRUNC(SYS
---------
02-AUG-04 <--- Wrong date.
SELECT TRUNC(SYSDATE-22)/86400 from dual;
SELECT (TRUNC(SYSDATE)-22)/86400 from dual;
These two SQL statements gave the error:
ORA-00932: inconsistent datatypes
If I try this one, it works.
SELECT TRUNC(SYSDATE - 22), TO_DATE(TO_CHAR(TRUNC(SYSDATE-22+1), 'DD-MON-YYYY
HH24:MI:SS'),
'DD-MON-YYYY HH24:MI:SS') from dual;
Is there any way to improve this lengthly statement?
Thanks,
Wes
--- Edgar Chupit <edgar.chupit@xxxxx> wrote:
> Hello Wes,
>
> WB> WHERE TRUNC(last_update_date) = TRUNC(SYSDATE - 1)
> WB> How to improve the performance? Do I need to create a new index field on
> the table with
> TRUNC(last_update_date)?
>
> You have several opportunities:
> a) you can rewrite your query to this:
> where last_update_date between trunc(sysdate)-1 and
> trunc(sysdate)-1/86400
> b) you can create function based index like:
> create index tt_idx on tt(trunc(last_update_date));
> c) you can add column to your table with values from trunc(last_update_date)
>
> What option to choose mostly depends on your requirements.
----------------------------------------------------------------
Please see the official ORACLE-L FAQ: http://www.orafaq.com
----------------------------------------------------------------
To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx
put 'unsubscribe' in the subject line.
--
Archives are at //www.freelists.org/archives/oracle-l/
FAQ is at //www.freelists.org/help/fom-serve/cache/1.html
-----------------------------------------------------------------
Other related posts:
