Vadim,
excellent answer. answers the question and the
underlying intent, and takes into account performance.
jack
- Vadim Gorbounov <vgorbounov_at_724.com> wrote:
> To avoid aggregates you can :
>
> delete from table t where not exists (select null
> from table x
> where t.USER_ID=x.USER_ID and t.CREATED >
> x.CREATED);
>
> it seems to run faster given the USER_ID and CREATED
> are indexed
>
> -----Original Message-----
> Sent: Tuesday, July 09, 2002 1:00 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Hi,
>
> Can anyone help me with this delete statement?
>
> I have the following table:
>
> Name Null?
> Type
> ----------------------------------------- --------
> -------------
> USER_ID NOT NULL
> NUMBER(15)
> PASSWORD
> VARCHAR2(30)
> CREATED
> DATE
>
> What I need to do is delete the oldest record for a
> particular user_id.
> And its doing my head in. Any help appreciated!
>
> Thanks,
> Steve.
>
> --
> Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> --
> Author: Steven Hovington
> INET: steven.hovington_at_procession.com
>
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> Author: Vadim Gorbounov
> INET: vgorbounov_at_724.com
>
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--
Author: Jack Silvey
INET: jack_silvey_at_yahoo.com
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Received on Tue Jul 09 2002 - 13:30:35 CDT
