Old versions of the SQL standard (SQL-92) only allowed sorting by output column name or number. The current version of RDMSs are fine.

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

What's wrong with it? It's supported by all SQL implementations which I know. In oposite to aliases, which are supported only in some of them.

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?

Hey shvetsovdm, thanks for the notes I really appreciate. You are right, I will do this way in the next time.

Peace!

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_.