Thanks Keoki for your response.<br><br>But I think I have oversimplified my problem. My situation is that I have to GROUP the results generated from a formula:<br><br>{field_1} - {field_2}<br><br>The GROUP has been 'specified' into 0,1,2....29. My problem is that, for example, none of the results is 15, then the GROUP '15' will not be shown. What I want is something like<br><br>Group Count<br>----- -----<br> 15 0<br><br>As simple as that? Thanks very much, It really bothers me for a while.<br><br>>yuenie.