def create_table(name)
      if ! db.tables.include?(name.to_sym)
        db.create_table name do
          String :name, :size => 15
          Float :freq
          index :freq
        end
      end
    end
def create_table(name)
      if ! db.tables.include?(name.to_sym)
        db.create_table name do
          String :name, :size => 15
          Float :freq
          index :freq
        end
      end
    end
create a name table