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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.
Remember you need to get the avg into a string and above all, you need to cast at least one of the variables as numeric otherwise you'll get 0 everywhere. PostgreSQL is awful.