Design table and query structure

[smayshar]

I was requested to build a form for the assingment of monthly work shifts. Both the workers and shifts are flexible per month. I need the form column header to be the worker, the row header to be the shifts and the values in the "table" to be a text filled by the user.
I built a table that is filled with workers per month and I have the list of shifts per month. How do I build the query behind the form needed?