SELECT TYPE FROM ship WHERE flag  =  'Panama' INTERSECT SELECT TYPE FROM ship WHERE flag  =  'Malta'
Find the ship type that are used by both ships with Panama and Malta flags.
SELECT TYPE FROM ship WHERE flag = 'Panama ' INTERSECT SELECT TYPE FROM ship WHERE flag = 'Malta '
select type from ship where flag = value intersect select type from ship where flag = value
Find the ship type that are used by both ships with Panama and Malta flags .