How to get lines with English letters at the end of race

Hi all

Examples of data include:
create table test_app(application_no number, net_code number,branch varchar2(40));

insert into test_app values(1001,01,'operations')
insert into test_app values(1001,02,'production');
insert into test_app values(1001,03,'testing')
insert into test_app values(1002,01,'power coding');
insert into test_app values(1002,02,'testing')
insert into test_app values(1002,03,'export');
insert into test_app values(1002,03,'operations');
SQL> select*from test_app
  2  where application_no=1001;

APPLICATION_NO   NET_CODE BRANCH
-------------- ---------- -----------
          1001          1 operations
          1001          2 production
          1001          3 testing
  1  select*from test_app
  2* where application_no=1002
SQL> 

APPLICATION_NO   NET_CODE BRANCH
-------------- ---------- --------------
          1002          1 power coding
          1002          2 testing
          1002          3 export
          1002          3 operations
But my real need is delivered as follows:

If an application having more then a result lines then
I must add A, B, C, D... up to the total number of rows in the result set.
Surely it will not exceed more then 26 ranks (will not exceed 'Z');



the result should is:

ask any = 1001

DIRECTORATE GENERAL OF THE NET_CODE OF THE APPLICATION_NO
-------------- ---------- -----------
1001 operations 1
2-1001 production_A
1001 3 testing_B


ask any = 1002


DIRECTORATE GENERAL OF THE NET_CODE OF THE APPLICATION_NO
-------------- ---------- --------------
1002 1 power coding
1002 2 testing_A
3 1002 export_B
3 1002 operations_C

If we have 10 lines to the appication = 1002;



DIRECTORATE GENERAL OF THE NET_CODE OF THE APPLICATION_NO
-------------- ---------- --------------
1002 1 power coding
1002 2 testing_A
3 1002 export_B
3 1002 operations_C
.... ..........._I

Note: first line should add with no letters. Add letters with the second row.

How to achieve this result. Please help me...

Published by: roots on 6 March 2012 09:14 
select  application_no,
        net_code,
        branch ||
        case
          when row_number() over(partition by application_no order by net_code,branch) > 1
            then '_' || chr(ascii('A') + row_number() over(partition by application_no order by net_code,branch) - 2)
        end branch
  from  test_app
  order by application_no,
           net_code,
           branch
/

APPLICATION_NO   NET_CODE BRANCH
-------------- ---------- -----------------
          1001          1 operations
          1001          2 production_A
          1001          3 testing_B
          1002          1 power coding
          1002          2 testing_A
          1002          3 export_B
          1002          3 operations_C

7 rows selected.

SQL>

SY.

Tags: Database

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