SELECT rank FROM captain EXCEPT SELECT rank FROM captain WHERE CLASS  =  'Third-rate ship of the line'
Find the captain rank that has no captain in Third-rate ship of the line class.
SELECT rank FROM captain EXCEPT SELECT rank FROM captain WHERE CLASS = 'Third-rate ship of the line '
select rank from captain except select rank from captain where class = value
Find the captain rank that has no captain in Third-rate ship of the line class .