My non-profit organization works with low-income people on employment
training. I collect and analyze follow-up statistics for changes in
salaries, education, employment, etc. over a 3, 6, and 12-month
period. I have added a field in the subform for the data collector to
choose which period the information is. Now I need to report on the
differences (hopefully increases)in these benchmarks. How do I design
a query that will give me these results?

Thank you so much in advance.