Null value in parameter form.

In parameter form I want to leave blank option in order to print a report for all the values in the parameter form. I am writing the query for the parameter LOV that it fetches the values and making a union with 'select to_char(null) from dual.
I am getting a blank and the required output when the report is run using the report builder but the this blank space or null value disappears when the report is run on application server 10g. It seems to be a small problem but I am not able to get a solution for this. Please, suggest something.

Hi,
Instead of a Null, why not use '-ALL-',
   union all
   select '-ALL-'
   from    dualthen in your query, you will have,
where column_1 = decode(:param1, '-ALL-', column_1, :param1) that way it will be more clearer for the users that if they picked '-ALL-' in the LOV that they will get all records and will eliminate the problem you are having with null when you deploy your report in application server.
-Marilyn

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