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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.
This problem is very difficult to understand, I still don't understand what the question is.
E.g. ".. after I save 12"... 12 what? days? weeks? units of money? Ah! It's after the saturday where I saved 12 units. Difficult to catch.
Then there is a table of days with missing values... is it zero?
And finally, what's the point of mentioning the planet? Just to number the weeks?
Allows duplicates in result.