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system
<p>Hi, I'm currently learning Rails and following a tutorial. The tutorial instructed me to edit the migration file after creating the app, and then run "rake db:migrate" and "rake db:create". I followed the instructions and edited the migration file as shown below:</p>

```
class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :username
      t.string :email
      t.string :encrypted_password
      t.string :salt
      t.timestamps
    end
  end
end
```

<p>However, when I ran "rake db:migrate", I encountered an error:</p>

```
Mysql2::Error: Table 'users' already exists: CREATE TABLE `users` ...
```

<p>After that, when I ran "rake db:create", I got the following output:</p>

```
user_auth_development already exists
user_auth_test already exists
```
user
<p>It appears that you have already run the migration once, which is why you are getting the error when trying to run it again. The error message "Table 'users' already exists" indicates that the table named "users" has already been created in your database. This could be because you previously ran the migration successfully.</p>

<p>If you want to start fresh and recreate the database, you can use the command <code>rake db:drop db:create db:migrate</code>. This command will first drop the existing database, then create a new one, and finally run the migration to create the "users" table again.</p>

<p>However, if you don't want to recreate the entire database, you can simply ignore the error and continue with your development. Since the migration has already been applied, the "users" table should be available for use in your application.</p>
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