SELECT rank FROM captain WHERE CLASS  =  'Cutter' INTERSECT SELECT rank FROM captain WHERE CLASS  =  'Armed schooner'
Find the captain rank that has some captains in both 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
Find the captain rank that has some captains in both Cutter and Armed schooner classes .