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Editorial Team
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Asked: 2026-05-15T19:55:58+00:00

I need to have an optional parameter or a parameter that’s default value is

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I need to have an optional parameter or a parameter that’s default value is null.

I want to use a dropdown list for a report, the list is getting it’s values from another dataset. I have selected the option to allow NULL values. I have tried setting the default value to null and all the other settings available. Is there some way to make this dropdown optional or have the default value as NULL?

I’ve searched and found this question that was asked and comes close but does not answer the optional/null question…In the query for the report I am making sure the value is either NULL or not:
SQL Server Reporting Services – Set default value for multi-value report parameter

(@assignedTo is null or @assignedTo = [User].UserInfo.FirstName +' '+ [User].UserInfo.LastName)
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1 Answer

  1. Editorial Team

    Did you try this for your dataset query:

    SELECT userName as Label, userId as Value FROM dbo.users
    UNION ALL
    SELECT ‘All Users’, NULL

    Then add a default value set to null

    This should work. for reuse, I often encapsulate this pattern with an inline udf

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