rake db：create vs rake db：create：all

Question

rake db:create和rake db:create:all有什麼區別？
兩者同樣用於爲Rails應用程序創建數據庫。
關於Rails Rake的最詳盡信息，我可以在tutorialpoint找到，但上面的命令不見了。

Answer 1

rake db:create:all creates all the databases for the application (which are defined in database.yml) 

rake db:create creates the database for the current RAILS_ENV environment. If RAILS_ENV is not specified it defaults to the development and test databases. 

FYI：http://jacopretorius.net/2014/02/all-rails-db-rake-tasks-and-what-they-do.html

Answer 2

一個爲當前環境創建數據庫。

一個創建的DB爲所有環境。

Answer 3

如果運行rake -T | grep db，您將看到：

rake db:create 
# Creates the database from DATABASE_URL or config/database.yml for the current RAILS_ENV 
# (use db:create:all to create all databases in the config)