# Migration **URL:** \ **Category:** Ruby\ **Created:** [March 19, 2010, 5:57am UTC](https://www.ruby-forum.com/t/migration/185392 "2010-03-19T05:57:01Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![mailtorajuit](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ed8c4c/32.png) [@mailtorajuit](https://www.ruby-forum.com/u/mailtorajuit)\ **Post date:** [March 19, 2010, 5:57am UTC](https://www.ruby-forum.com/t/migration/185392/1 "2010-03-19T05:57:01Z")
Hi all, I have migrated with some tables in my application. After some days i need to add few more tables to database. The initial tables in database have some data. when i try to migrate the database for second time with rake db:migrate it is saying the alredy table exist and rake is aborted. i dont want to loose the old data and i want to add new tables to alredy exiested database how to do this. Please help me. Regards, Rajkumar. ---
**Author:** ![mailtorajuit](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ed8c4c/32.png) [@mailtorajuit](https://www.ruby-forum.com/u/mailtorajuit)\ **Post date:** [March 19, 2010, 7:00am UTC](https://www.ruby-forum.com/t/migration/185392/2 "2010-03-19T07:00:05Z")
On Thu, Mar 18, 2010 at 10:57 PM, Rajkumar S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)wrote: > ## Regards, Rajkumar. > > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). Hi, this is the Ruby Mailing List / Forum, I think you probably want Ruby on Rails. A first thought, though, since it sounds like you are talking about ActiveRecord, would be that you must have named your tables something you already have in the db. Check to see if this is the case by looking at your db/schema.rb file, maybe you already implemented it and forgot. If this is the case, then you should have another migration which already adds this table, you might look and see what you did there to figure out why you are confused. If it isn’t the case, then you probably need to use more creativity when naming your tables 😛 and you’ll want to look into rename\_table at > **[ActiveRecord::Migration](https://api.rubyonrails.org/classes/ActiveRecord/Migration.html)** > > Active Record Migrations Migrations can manage the evolution of a schema used by several physical databases. ---
**Author:** ![mailtorajuit](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ed8c4c/32.png) [@mailtorajuit](https://www.ruby-forum.com/u/mailtorajuit)\ **Post date:** [March 19, 2010, 12:11pm UTC](https://www.ruby-forum.com/t/migration/185392/3 "2010-03-19T12:11:29Z")
On Fri, Mar 19, 2010 at 6:59 AM, Josh C. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > On Thu, Mar 18, 2010 at 10:57 PM, Rajkumar S. > > [ActiveRecord::Migration](http://api.rubyonrails.org/classes/ActiveRecord/Migration.html) This might be quite a bit more accessible: > **[Active Record Migrations — Ruby on Rails Guides](https://edgeguides.rubyonrails.org/active_record_migrations.html)** > > Active Record MigrationsMigrations are a feature of Active Record that allows you to evolve your database schema over time. Rather than write schema modifications in pure SQL, migrations allow you to use a Ruby DSL to describe changes to your... HTH Robert ---
**Author:** ![mailtorajuit](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ed8c4c/32.png) [@mailtorajuit](https://www.ruby-forum.com/u/mailtorajuit)\ **Post date:** [March 19, 2010, 2:31pm UTC](https://www.ruby-forum.com/t/migration/185392/4 "2010-03-19T14:31:59Z")
On Fri, Mar 19, 2010 at 5:10 AM, Robert D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)wrote: > – > Learning without thought is labor lost; thought without learning is > perilous.” > — Confucius They are, I was going to link to both, but the guides don’t talk about renaming tables 🙂