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'
How many credits is Care and Feeding of Cats?
select credits from course where title = 'Care and feeding of Cats'
What is the course id of that?
select course_id from course where title = 'Care and feeding of Cats'