Hi! I have table containing name of the student and its enrolled subjects.

John Doe Eng1
John Doe Mat1
John Doe Sci1
John Doe P.E.1

I can already display names in the combobox, problem is if the name john doe appears in the table 4x then it will also appear 4x in the combobox. How do i filter it so that combobox will only display the name once. I am using IDNumber as primary in my table (sql).