What are the names of storms which don't have affected region in record?
select name from storm where storm_id not in ( select storm_id from affected_region )
What is the number of city affected for storm with name two?
select number_city_affected from affected_region where storm_id = ( select storm_id from storm where name = 'Two' )
What is storm name two storm ID?
select storm_id from storm where name = 'Two'