ruby on rails - How to know my username and password in mysql console -

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I have installed mySQL .. I have entered my password, but I do not remember that they gave me a username It is said ... Is it the administrator or the root?

I have a Rubyrenales database. IML

I can remember that I have got a command which tells me the username and password in mysql console .. but it can not be found again!

I want to add that part to my database.yml 

  development: adapter: mysql database: myprojectname_development username: unknown password: devrailspassword host: localhost

Since I started development only, I have no database yet, so there is no way of trial and error (I do not know) 

  user 'unknown' @ '%' is identified by 'devrailspassword' Received; Allow all authorizations on 'myprojectname_development`. * '' '%' With grant option 'unknown';

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