LOV in paramter form

Question

Hi All,
I have a parameter called FF_Code and have created a LOV
the values are 01A, 02B,03A...11B( database values)as option .
And my DATA_MODEL looks like this
SELECT
     FF_CODES.FF_CODE ,REQUEST_DATE
     EMPLOYEES.FIRST_NAME, EMPLOYEES.LAST_NAME
FROM
     EMPLOYEES EMPLOYEES,
     FF_CODES FF_CODES
WHERE
     FF_CODES.EMPLOYEE_ID = EMPLOYEES.EMPLOYEE_ID(+) AND
     FF_CODES.FF_CODE = :P_FF_CODE AND
     REQUEST_DATE >= TRUNC(TO_DATE (:STARTDATE , 'DD/MM/YYYY') ) AND
     REQUEST_DATE <= TRUNC(TO_DATE (:ENDDATE, 'DD/MM/YYYY'))
I am able to dispaly the output for just selecting one option for FF_CODE. I want to give user the option where he should be able to select all. Can I do this??
Can I have option something like "ALL" . if "ALL" is selected the output should dispaly the result for all the FF_CODES?
Please help

Answer 1

I got it guys,
all u need to do is
in the user parmeter wrie a select statement
select "ALL" from dual
union
select ff_code from ff_code
and in the modle's where condition check
decode (:ff_code,'ALL', ff_code,:ff_code)