query: SELECT title FROM course WHERE dept_name  =  'Statistics' EXCEPT SELECT title FROM course WHERE dept_name  =  'Psychology'
question: What the titles of courses are in the Statistics department one but not the 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: What the titles of courses are in the Statistics department one but not the Psychologys department?