Comments on: secondmax

By: Laurent Schneider

Laurent Schneider — Wed, 16 Jul 2008 13:39:22 +0000

me too, but XML is huge!!! good luck

By: AketiJyuuzou

AketiJyuuzou — Wed, 16 Jul 2008 12:48:11 +0000

Wow!!

greate solution.
I did not realize to use extractValue.
I will study XML.

In my old posts, my usage of code-tag was wrong.
My solution was below.


select RTrim(Ltrim(
RegExp_Substr(XMLAgg(XMLElement("dummy",SAL)
                                 order by SAL desc),'>[^>]+<',1,2),'>'),'<') sal
from scott.emp;

SAL
—-
3000

By: Laurent Schneider

Laurent Schneider — Wed, 16 Jul 2008 11:53:13 +0000

One more try to show what I learnt from Marco

select extractvalue(XMLAgg(XMLElement(SAL,SAL) order by SAL desc),’//SAL[2]/text()’) SAL FROM EMP

SAL
—-
3000

By: Laurent Schneider

Laurent Schneider — Wed, 16 Jul 2008 11:51:03 +0000

Ok, let’s do it with XMLish functions

select extractvalue(XMLAgg(XMLElement(SAL,SAL) order by SAL desc),’/SAL[2]‘) FROM EMP;

EXTRACTVALUE(XMLAGG(XMLELEMENT(SAL,SAL)ORDERBYSALDESC),’/SAL[2]‘)
——————————————————————————–
3000

By: Laurent Schneider

Laurent Schneider — Wed, 16 Jul 2008 11:34:02 +0000

no, I do not see your query but I could imagine something like


select 
  RegExp_Substr(
    XMLAgg(
      XMLElement(SAL,SAL) order by SAL desc),
    '<.*?>.*?'
  ,1,2) 
FROM EMP;

By: AketiJyuuzou

AketiJyuuzou — Wed, 16 Jul 2008 11:02:44 +0000

Oh, code-tag of my post was disable.

But I think that Laurent Schneider can understand my solution.

I got hint from this article which used group_concat of MySQL.
http://www.onlamp.com/pub/a/mysql/2007/03/29/emulating-analytic-aka-ranking-functions-with-mysql.html?page=4

By: AketiJyuuzou

AketiJyuuzou — Wed, 16 Jul 2008 10:58:05 +0000

Oh I post again.
I have used code-tag.

My funny solution

[code]
select RTrim(Ltrim(RegExp_Substr(XMLAgg(XMLElement(”dummy”,SAL) order by SAL desc),’>[^’),’

By: AketiJyuuzou

AketiJyuuzou — Wed, 16 Jul 2008 10:56:58 +0000

My funny solution

select RTrim(Ltrim(RegExp_Substr(XMLAgg(XMLElement(”dummy”,SAL) order by SAL desc),’>[^’),’

By: radino

radino — Fri, 11 Jul 2008 05:11:00 +0000

I would not use RANK()..


SQL> SELECT ENAME, SAL FROM (
  2    SELECT ENAME, SAL FROM EMP ORDER BY SAL DESC)
  3  WHERE ROWNUM < 5;
 
ENAME            SAL
---------- ---------
KING         5000,00
SCOTT        3000,00
FORD         3000,00
JONES        2975,00
 
SQL> 
SQL> 
SQL> SELECT SAL
  2  FROM (
  3    SELECT RANK() OVER (ORDER BY SAL DESC) R,SAL FROM EMP)
  4  WHERE R=2;
 
      SAL
---------
  3000,00
  3000,00
 
SQL> 
SQL> 
SQL> UPDATE EMP
  2  SET SAL=5000
  3  WHERE ENAME='JONES';
 
1 row updated
 
SQL> 
SQL> 
SQL> SELECT SAL
  2  FROM (
  3    SELECT RANK() OVER (ORDER BY SAL DESC) R,SAL FROM EMP)
  4  WHERE R=2;
 
      SAL
---------
 
SQL> 
SQL> ROLLBACK;
 
Rollback complete