I have a database holding details of students and training courses. One of
the reports produces stats for selected years and selected category of
courses, the year and category being set as parameters in the underlying
query. The parameters are selected by the user from a combo box on a form.
What I would like to do is give the user the option of selecting 'All
Categories' in the combo box and the report therefore, effectively ignore
this parameter, i.e. produce a report for a selected year but showing stats
for all categories of course. How would I do it?

TIA

Martin Watts