SELECT rank FROM captain WHERE CLASS  =  'Cutter' INTERSECT SELECT rank FROM captain WHERE CLASS  =  'Armed schooner'
What are the ranks of captains that are both in the Cutter and Armed schooner classes?
SELECT rank FROM captain WHERE CLASS = 'Cutter ' INTERSECT SELECT rank FROM captain WHERE CLASS = 'Armed schooner '
select rank from captain where class = value intersect select rank from captain where class = value
What are the ranks of captains that are both in the Cutter and Armed schooner classes ?