Re: Renumber a set of grupped rows?

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Wed, 21 Jan 2004 08:14:26 -0800
Message-ID: <F001.005DDC49.20040121081426@fatcity.com>

Although you've had a row-at-a-time version from someone, you might try something like the following if you can't do a "create as select" to rebuild the original data.

Create table temp
pctfree 0
nologging
as
select

        rowid    e_rowid,
        row_number() over (PARTITION BY DEPTNO order by deptno) x

from emp;

create unique index t_i on temp(e_rowid); alter table temp modify e_rowid not null;

update emp e
set

req_id = (

        select x from temp t
        where t.e_rowid = e.rowid

);

(Just making it up as I go along, so I won't guarantee that it works).

Regards

Jonathan Lewis
http://www.jlcomp.demon.co.uk

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Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Wednesday, January 21, 2004 3:04 PM

> Just out of curiocity, and while I am trying to learn about Row_NUMBER(),
> how would you code the following to do an update on the 2nd column?
>
> >select deptno, row_number() over (PARTITION BY DEPTNO order by deptno) x
> >from emp
>
> thx
> maa

-- 
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-- 
Author: Jonathan Lewis
  INET: jonathan_at_jlcomp.demon.co.uk

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Received on Wed Jan 21 2004 - 10:14:26 CST