Need a help in PL/SQL array

Question

Hi below is my requirement
I need to generate value AA to ZZ. I know we can do with this in squencer, But I want this in Array such that if the value passed is AD the return should be AE.. if value sent is AZ then it should return BA
Inner loop handles A to Z and Outer loop ahndles A-Z.. So if we pass AR the inner loop wijj go till R when it finds matching R then it should pick next value i.e S
and write AS.
Please help me in doing this with Array function in PL/SQL
Thanks in advance
Edited by: shrivatsa on Apr 28, 2009 2:40 PM

Answer 1

Not sure why you need a plsql array for this. With above provided sql you could do it also like this:
SQL> var code varchar2(3)
SQL> exec :code := 'FFF'
PL/SQL procedure successfully completed.
SQL> with table1 as (
select '1FFFAA' str from dual union all
select '2FFFAB' from dual union all
select '3CCCAR' from dual union all
select '4CCCAS' from dual union all
select '5RRRAY' from dual union all
select '6RRRAZ' from dual
h as
select a||b ab, lead(a||b) over (order by a,b) next
   from (select chr(64+level) a from dual connect by level <= 26),
        (select chr(64+level) b from dual connect by level <= 26)
select max(:code || next) next
  from table1, h
where substr(str,-5,3) = :code
   and substr(str,-2,2) = ab
NEXT                             
FFFAC                            
1 row selected.
SQL> exec :code := 'RRR'
PL/SQL procedure successfully completed.
SQL> with table1 as (
select '1FFFAA' str from dual union all
select '2FFFAB' from dual union all
select '3CCCAR' from dual union all
select '4CCCAS' from dual union all
select '5RRRAY' from dual union all
select '6RRRAZ' from dual
h as
select a||b ab, lead(a||b) over (order by a,b) next
   from (select chr(64+level) a from dual connect by level <= 26),
        (select chr(64+level) b from dual connect by level <= 26)
select max(:code || next) next
  from table1, h
where substr(str,-5,3) = :code
   and substr(str,-2,2) = ab
NEXT                             
RRRBA                            
1 row selected.