Jacques, 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. Iain Nicoll -----Original Message----- Sent: 04 April 2003 20:24 To: Multiple recipients of list ORACLE-L
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:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> ] > > 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:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> ] > > 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: Nicoll, Iain INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
