class AddEntriesTable < ActiveRecord::Migration
          def self.up
            create_table :entries do |table|
              table.column :title, :string
              table.column :content, :text
              table.column  :created_at, :datetime
            end
          end

          def self.down
            drop_table :entries
          end
        end

Rake Migrate Migrations Create Table Example

table, textmate, rails

Rails