dropiing table will delete migration in rails code example
Example: rails migration remove column
rails g migration Remove..From.. col1:type col2:type col3:type
#Exemple :
rails g migration RemoveCountryFromSampleApps country:string
rails g migration Remove..From.. col1:type col2:type col3:type
#Exemple :
rails g migration RemoveCountryFromSampleApps country:string