How to do this in Procedure

Question

HI Friends,
I am using Oracle 11 g.
Please find the senarion and create table script with dummy data.
In my_table we have data also like
RA1340001,
RA1340002
In this case we need to change the data as
R134B0001
RB1340002
For changing the letter B we need to go to a dcn_control table where we are maintain data like(SNO, DATE_T, CAMPGN_ID)
(1,01-06-12,RA134)Suppose for this month the 2rd letter in CAMPGN_ID field is A then next month the letter is B alphabetically. Suppose the letter is Z then will update the data as A .
So the logic shud be If data ='RA1340001' Then check the second letter and increment+1 alphabetically to B and place the B after R134 so the value is
R134B0001
If the data ='RA1340002' then check the second letter and increment+1 alphabetically to B so the value is RB1340002.
======================
Please find the Table script.
=================
CREATE TABLE dcn_control
SNO NUMBER NOT NULL,
DATE_T date,
CAMPGN_ID VARCHAR2(7 BYTE) NOT NULL)
==============================
Create table my_table
data varchar2(10)NOT Null
========================
insert into my_table values(' RA1340001')
insert into my_table values(' RA1340002')
================
insert into dcn_control values(1,sysdate,'RA134')
Please let me know how to do this.
Thanks,
Lony

Answer 1

lony wrote:
In this case we need to change the data as
R134B0001
RB1340002What is the logic behind it? Is it odd/even? If so:
SELECT  t.data,
        u.campgn_id,
        CASE MOD(TO_NUMBER(SUBSTR(t.data,LENGTH(u.campgn_id) + 1)),2)
          WHEN 0 THEN SUBSTR(u.campgn_id,1,1) ||
                        CHR(
                            ASCII('A') +
                              MOD(
                                  ASCII(SUBSTR(u.campgn_id,2,1)) - ASCII('A') + 1,
                                  26
                           ) ||
                        SUBSTR(t.data,3)
          ELSE SUBSTR(u.campgn_id,1,1) ||
                 SUBSTR(u.campgn_id,3) ||
                 CHR(
                     ASCII('A') +
                       MOD(
                           ASCII(SUBSTR(u.campgn_id,2,1)) - ASCII('A') + 1,
                           26
                    ) ||
                 SUBSTR(t.data,LENGTH(u.campgn_id) + 1)
        END res
  FROM  my_table t,
        dcn_control u
  WHERE t.data like u.campgn_id || '%'
DATA       CAMPGN_ RES
RA1340001  RA134   R134B0001
RA1340002  RA134   RB1340002
SQL> SY.