the checkboxes of the professor and student are the same ?
no, use unique names for the checkboxes
the checkboxes ?
No, you would only need to do that if the chackboxes are namedthe same, but they should have unique names
column prof and column students .. that get the value from the checkbox that has been
"checked ". Right ?
yes, by binding the columns to the checkbox form element, it will insert the checked value "1" if the checkbox is checked, or leave it blank if the checkbox is not checked.