title: Adding 'Select All' option to a Single-Select Parameter in SSRS
body: <p>Not an advanced coder.  I need to add a 'Select All' option that will return all the results in the parameter...Normally I do this easily utilizing multi-select but am being asked to do this with a single select.  So the end-user can choose either ALL or one of the options in the parameter.  I was told to add an all option but not not visualizing.  Can anyone give some advice?  Thanks.</p>