gistfile1.rb

class CreateTableNameSequence < ActiveRecord::Migration 
  def up 
    #create sequence for categories table 
    execute <<-SQL 
  CREATE SEQUENCE table_name_id_seq 
	INCREMENT 1 
	MINVALUE 1 
	MAXVALUE 9223372036854775807 
	START 25 
	CACHE 1; 
    SQL 
  end 
 
  def down 
	DROP SEQUENCE table_name_id_seq; 
  end 
end