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| Re: Discoverer Desktop - Optional Parameters [message #158452 is a reply to message #158435] |
Sat, 11 February 2006 06:59  |
skooman
Messages: 913
Registered: March 2005
Location: Netherlands
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Senior Member |
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You can't. At least, up to version 9i you can't (I'm not sure about 10g).
Anyhow, although there is no option like "optional" for parameters, you can make it optional yourself. The way to do this, is to create a calculation, which results to "always true" if the user enters a certain value, like * (make sure you put that in the description!).
The steps are:
- create a condition, let's say on emp_name
- add new parameter, fi p_emp
- complete the condition with a calculation like:
decode(:p_emp,'*',emp_name,p_emp)
Explanation:
if the user enters * for the parameter, then the condition is: where emp_name = emp_name (which is obviously always true), if the user enters anything else but *, the condition is: where emp_name = value-entered-in-parameter.
Regards,
Sabine
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