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RE: Sub-query in order by clause

From: Jacques Kilchoer <Jacques.Kilchoer_at_quest.com>
Date: Fri, 04 Apr 2003 14:38:42 -0800
Message-ID: <F001.0057B014.20030404143842@fatcity.com>


Yes, I see that. (hangs head in shame)

> -----Original Message-----
> From: Nicoll, Iain [mailto:IAIN.D.NICOLL_at_saic.com]
>
> As I believe has been pointed out already it may possibly be
> more efficient
> if dept is very small and emp is very large (especially if
> there are filters
> and a join would be done before a filter was applied).
> Alternatively it may
> be that Oracle believe it is more intuitive to people with no
> preconceived
> ideas.
>
> -----Original Message-----
> Sent: 04 April 2003 20:24
>
> Why would you do that instead of
> SELECT emp.deptno, empno, ename
> FROM emp a, dept b
> WHERE dept.deptno = emp.deptno
> order by dept.deptname ;
>
> > -----Original Message-----
> > From: Nicoll, Iain [ mailto:IAIN.D.NICOLL_at_saic.com
> <mailto:IAIN.D.NICOLL_at_saic.com> ]
> >
> > Don't really know but couldn't it be useful if you had
> >
> > ORDER BY ( SELECT deptname FROM dept
> > WHERE dept.deptno = emp.deptno)

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Jacques Kilchoer
  INET: Jacques.Kilchoer_at_quest.com

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Received on Fri Apr 04 2003 - 16:38:42 CST

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