class ActiveRecord::ConnectionAdapters::Table

See {connection.remove_columns}[rdoc-ref:SchemaStatements#remove_columns]

t.remove(:qualification, :experience)
t.remove(:qualification)

Removes the column(s) from the table definition.

def remove(*column_names, **options)
  raise_on_if_exist_options(options)
  @base.remove_columns(name, *column_names, **options)
end