In oposite to aliases, which are supported only in some of them.

Interesting, can you share example what RDMS do not support column alias?

Sorry if it looks like I carp on you or your solution, It's not. I just want to learn from your solution.

Thanks

I like your solution, but did you think that referencing a column by order is a good practice?

Hi!

Look, this:

test_password == hashed_password

returns true or false.

This means you don't need the if/else statement.

Without if/else statement your solution is much better.

Nice!

Do you consider to create another function and construct whole song there? So it become posible in hq9:

"9" => 99_song(),

Is it too dificult for 8kyu level kata?

your even method can be simplified to:

def even(number)
  number % 2 == 0
end

because #== method returns boolean true or false.

And as you may already mention Intergers in Ruby has #odd? and #even? methods.

1.even? # => false
1.odd? # => true

Guys please note that in Ruby language get_sum method is bad style for method name. Just sum or sum_of or sum_of_two is much cleaner. No need for prefixes like get_ or set_.