How to add column dynamically based on user input in oracle?

Question

**how to add column dynamically based on user input in oracle?**
I am generating monthly report based on from_date to to_date below is my requirement sample table
EMPLOYEE_CODE| Name | CL_TAKEN_DATE | CL_BALANCE | 01-OCT-12 | 02-OCT-12 | 03-OCT-12
100001.............John...........02-OCT-12...............6
100002.............chris...........01-OCT-12...............4
Based on user input, that is, if user need the report from 01-OCT-12 TO 03-OCT-12, i need to add that dates as column in my table, like 01-OCT-12 | 02-OCT-12 | 03-OCT-12....
below is my code
create or replace
procedure MONTHLY_LVE_NEW_REPORT_demo
L_BUSINESS_UNIT IN SSHRMS_LEAVE_REQUEST_TRN.BUSINESS_UNIT%TYPE,
--L_LEAVE_TYPE_CODE           IN SSHRMS_LEAVE_REQUEST_TRN.LEAVE_TYPE_CODE%TYPE,
L_DEPARTMENT_CODE IN VARCHAR2,
--L_MONTH                    IN SSHRMS_LEAVE_REQUEST_TRN.LVE_FROM_DATE%TYPE,
L_FROM_DATE IN SSHRMS_LEAVE_REQUEST_TRN.LVE_FROM_DATE%TYPE,
L_TO_DATE in SSHRMS_LEAVE_REQUEST_TRN.LVE_TO_DATE%type,
MONTHRPT_CURSOR OUT SYS_REFCURSOR
AS
O_MONTHRPT_CURSOR_RPT clob;
v_return_msg clob;
BEGIN
IF (L_BUSINESS_UNIT IS NOT NULL
AND L_FROM_DATE IS NOT NULL
and L_TO_DATE is not null
-- AND L_DEPARTMENT_CODE IS NOT NULL
THEN
OPEN MONTHRPT_CURSOR FOR
select EMPLOYEE_CODE, EMPLOYEE_NAME AS NAME, DEPARTMENT_CODE AS DEPARTMENT,DEPARTMENT_DESC, CREATED_DATE,
NVL(WM_CONCAT(CL_RANGE),'') as CL_TAKEN_DATE,
case when NVL(SUM(CL2),0)<0 then 0 else (NVL(SUM(CL2),0)) end as CL_BALANCE,
from
SELECT DISTINCT a.employee_code,
a.EMPLOYEE_FIRST_NAME || ' ' || a.EMPLOYEE_LAST_NAME as EMPLOYEE_NAME,
a.DEPARTMENT_CODE,
a.DEPARTMENT_DESC,
B.LEAVE_TYPE_CODE,
B.LVE_UNITS_APPLIED,
B.CREATED_DATE as CREATED_DATE,
DECODE(b.leave_type_code,'CL',SSHRMS_LVE_BUSINESSDAY(L_BUSINESS_UNIT,to_char(b.lve_from_date,'mm/dd/yyyy'), to_char(b.lve_to_date,'mm/dd/yyyy'))) CL_RANGE,
DECODE(B.LEAVE_TYPE_CODE,'CL',B.LVE_UNITS_APPLIED)CL1,
b.status
from SSHRMS_EMPLOYEE_DATA a
join
SSHRMS_LEAVE_BALANCE C
on a.EMPLOYEE_CODE = C.EMPLOYEE_CODE
and C.STATUS = 'Y'
left join
SSHRMS_LEAVE_REQUEST_TRN B
on
B.EMPLOYEE_CODE=C.EMPLOYEE_CODE
and c.EMPLOYEE_CODE = b.EMPLOYEE_CODE
and B.LEAVE_TYPE_CODE = C.LEAVE_TYPE_CODE
and B.STATUS in ('A','P','C')
and (B.LVE_FROM_DATE >= TO_DATE(L_FROM_DATE, 'DD/MON/RRRR')
and B.LVE_TO_DATE <= TO_DATE(L_TO_DATE, 'DD/MON/RRRR'))
join
SSHRMS_LEAVE_REQUEST_TRN D
on a.EMPLOYEE_CODE = D.EMPLOYEE_CODE
and D.LEAVE_TYPE_CODE in ('CL')
AND D.LEAVE_TYPE_CODE IS NOT NULL
group by EMPLOYEE_CODE, EMPLOYEE_NAME, DEPARTMENT_CODE, DEPARTMENT_DESC, CREATED_DATE
else
v_return_msg:='Field should not be empty';
end if;
END;
my code actual output
EMPLOYEE_CODE| Name | CL_TAKEN_DATE | CL_BALANCE
100001....................John............02-OCT-12.................6
100001....................chris...........01-OCT-12.................4
how to add column dynamically based on from_date to to_date?
Thanks and Regards,
Chris Jerome.

Answer 1

You cannot add columns dynamically. But you can define a maximum number of numbers and then hide unused columns in your form useing SET_ITEM_PROPERTY(..,VISIBLE, PROPERTY_FALSE);