I have to come up with a report each month with a daily count of system users in our call center (# varies a lot each month - very seasonal).  Here's the situation - there's nothing in the data which would consistently let me do a distinct count of user ID's by date, because not everyone does the same task each day.  However, everyone either either does Task A or Task B (or both), and the data for these tasks exists in two separate tables - Table A and Table B.  It's easy to do a report to show a distinct count of each, but how do I combine the groups (or whatever would work) to get a distinct count of every user name which is in Table A, B, or both?  I hope that makes sense to you!