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Reverse function in oracle

Posted by sriram on December 9, 2009


SQL> select reverse('sriram oracle DBA') from dual;

REVERSE('SRIRAMOR
-----------------
ABD elcaro marirs

As this reverse funcction is undocumented we can achive the same using a procedure........

SQL> create or replace procedure rev(x in varchar2) as
2 c char(1);
3 i number;
4 begin
5 for i in 1..length(x) loop
6 select substr(x,length(x)-i+1,1) into c from dual;
7 dbms_output.put(c);
8 end loop;
9 dbms_output.put_line(' ');
10 end;
11 /

Procedure created.

SQL> exec rev('sriram oracle DBA');
ABD elcaro marirs

PL/SQL procedure successfully completed.

SQL>

sriram.

Source : http://www.oracle.com/code tips

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