Find the title of course that is provided by Statistics but not Psychology departments.
SELECT title FROM course WHERE dept_name  =  'Statistics' EXCEPT SELECT title FROM course WHERE dept_name  =  'Psychology'
SELECT title FROM course WHERE dept_name  =  'Statistics' EXCEPT SELECT title FROM course WHERE dept_name  =  'Psychology'
[{'title': 'Care and Feeding of Cats'}, {'title': 'Composition and Literature'}, {'title': 'Differential Geometry'}, {'title': 'UNIX System Programmming'}]