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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.
Because these two behave very differently. Most of the challenges are intended to be run with Postgres.
You don't have to create a new table. You are supposed to write a
SELECT
query. I will clarify this in the solution setup.