syntax to remove column in rails code example

Example 1: how to remove columns from rails

rails generate migration RemoveFieldNameFromTableName field_name:datatype

remove_column :table_name, :column_name

Example 2: rails migration remove column

rails g migration Remove..From.. col1:type col2:type col3:type

#Exemple :

rails g migration RemoveCountryFromSampleApps country:string