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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Sub-query in order by clause
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?
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