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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.
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This is one of those inmstances where if it had been MySQL I would have gotten it right the first time with SQUARE()...
I learned about using commas on the left of the select statements from a DBA I worked with for a few years. He siad it was mainly used with larger datasets, but it allows you to delete the last select without having to also remove the comma on the previous line.
Questions on this Kata:
users
instead ofuser
as the table name?