Suppressing NULLor space in prompt start.

hi all,
I have a prompt which populates value based on other prompt on the same DBrd.
Using below in the SQL result I get the required output, but along also a null or a space above that.
I want just the value to be populated in the prompt as default & noting other. can anything be written in Default To?
SELECT Periods."Period Code" FROM "PA - Profit and Loss" WHERE Periods."Current Period"='@{Current}'
Thanks a lot...

Hi Friends,
Its amazing how does it not work from my end...are u sure it doesnt give the null..
What i m doing exactly..
1st Dashbrd page prompt:
I select Period name like JUN-08, having presentaion variable (Current).. Note: i have a default period set here i.e. Jun-08.
2nd Dshbrd page Prompt:
it is bascically based on the value in 1st presentation variable.
And here is the SQL result.
*SELECT Periods."Period Code" FROM "PA - Profit and Loss" WHERE Periods."Current Period"='@{Current}'*
Also in the Default to we have SQL:
*SELECT min(Periods."Period Code") FROM "PA - Profit and Loss" WHERE Periods."Current Period"='@{Current}'*
Note: i m not sure if variables are accepted in SQL.
Even after doing what u guys said.. i seem to get This Character *)ngntn(* above our required value.
John, Kishore can u please tell me if i need to set a default value here too in 2nd prompt too. I actuall dont need as some value will always come one i navigate on some Column from first to the 2nd..
Please help me get the soln as this is a show stopper.
Thanks

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