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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.
Right... Good call. In that case, the sales table should have a default for the department id field set to 0, and then the unknown row would have an ID of 0
If the db is built properly, the departments table would have a null row that would have the name "Unknown"