Change Reports query from Form

Hi,
Can I use PL/SQL in a Form to modify or add to the Report's query in runtime?
i.e
If a Text Item in a form was left blank in then I would like to modify the WHERE clause
in the Report to remove one of the parameter defined.
in Report's query
WHERE a.myfield >= :p_1 and a.myfield <= :p_2
become
WHERE a.myfield >= :p_1
if the Text Item in form (for p_2) was left blank.
Any help would be greatful.
Many Thanks,
Buntoro

Hi,
you can use lexical parameter to do this thing
It's better if you change your query to
select * from emp where &where_clause
here,
where_clause is a parameter with some default value. U must give some default value to it.
ans then pass this parameter from form..
hope it will help you...
...

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