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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Oh, I see now, I think it just seems clear enough for me, but I guess, you're right, your code is more clear. Thanks for pointing it out!
I'm sorry, I don't understand your question, It's just different order of addends, the result is the same.
The equivalent solutions in upper case and lower case in SQL are not grouped together but should be.