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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.
I firstly used rank() over (partition by people_id order by sth) and the result was also 1 for all the people, and all tests was positive. Additional tests seems to be necessary