```ruby
class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :name

      t.timestamps null: false
    end
  end
end
```

Add column to test table definition
user
```ruby
class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :name
      t.integer :age, default: 0

      t.timestamps null: false
    end
  end
end
```
assistant