Regarding swapping of two variables

i have two variables of type varchar2. i need to swap them using a procedure which takes two variables as arguments and returns them swapped.
can anyone give me the complete pl-sql procedure for the same.
i am new to pl sql.
thanks.
Edited by: user12773921 on Mar 9, 2010 8:48 AM
Edited by: user12773921 on Mar 9, 2010 8:50 AM

Hi,
You can't call a procedure from a SQL statement.
If you want to swap columns in a query, just use aliases:
SELECT       ename          AS hiredate
,       hiredate        AS ename
FROM       scott.emp
ORDER BY ename
;Output:
HIREDATE   ENAME
SMITH      17-Dec-1980
ALLEN      20-Feb-1981
WARD       22-Feb-1981
JONES      02-Apr-1981
BLAKE      01-May-1981
CLARK      09-Jun-1981
TURNER     08-Sep-1981
MARTIN     28-Sep-1981
KING       17-Nov-1981
JAMES      03-Dec-1981
FORD       03-Dec-1981
MILLER     23-Jan-1982
SCOTT      19-Apr-1987
ADAMS      23-May-1987Notice that the alias is used in the ORDER BY clause.

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* To change this template, choose Tools | Templates
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* @ Author des Soldat Gottes
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