query: SELECT title FROM course WHERE dept_name  =  'Statistics' EXCEPT SELECT title FROM course WHERE dept_name  =  'Psychology'
question: Are Finding title course that is provided by Statistics but not Psychologys department.
query_toks: SELECT title FROM course WHERE dept_name = 'Statistics ' EXCEPT SELECT title FROM course WHERE dept_name = 'Psychology '
query_toks_no_value: select title from course where dept_name = value except select title from course where dept_name = value
question_toks: Are Finding title course that is provided by Statistics but not Psychologys department.