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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.
Thanks a lot for your recommendation. I'd rather keep it very easy. This kata is meant for the absolute beginners, and I created it to encourage absolute beginners to learn SQL.
This is a great kata for a beginner SQL developer but if you want to add a level of difficulty maybe make them use order by or show the names and age in ascending order.