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RE: Sub-query in order by clause

From: Jacques Kilchoer <Jacques.Kilchoer_at_quest.com>
Date: Fri, 04 Apr 2003 11:23:42 -0800
Message-ID: <F001.0057AB3F.20030404112342@fatcity.com>


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]
>
> Don't really know but couldn't it be useful if you had
>
> ORDER BY ( SELECT deptname FROM dept
> WHERE dept.deptno = emp.deptno)
>
>
> -----Original Message-----
> From: Ashish [mailto:ash03_at_att.net]
>
> In Oracle 9.2.0.1, you can now order by using a single-row subquery
> Here is an example:
>
> SELECT emp.deptno, empno, ename
> FROM emp
> ORDER BY ( SELECT deptno FROM dept
> WHERE dept.deptno = emp.deptno );
>
> The question I have is what is the usefulness of this? Under which
> circumstances
> this can be used?

-- 
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 - 13:23:42 CST

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