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Multi-Select with NULL option?

Posted By:      Posted Date: May 22, 2011    Points: 0   Category :


Using SSRS 2005 I have a detail report that takes three parameters.  Two are date parameters and are not a problem.  I use the third parameter as a lookup for a staff ID.  I have it setup as a multi-value, allowing blanks and pulls from a data set.  This basically works, however sometimes this field is left blank in the database set as NULL.

To also capture the NULL records I have the following in the WHERE clause of the dataset query:

AND (staff.staff_id IN (@staffid) OR staff.staff_id IS NULL)

The trouble with this is that if someone selects a sub set of the staff IDs the records with staff ID = NULL always gets reported too.  I would like to change this so that if you select a specific staff ID only

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