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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.
And with reason too, this should be a 6kyu kata since it deals with specific behaviour and not general SQL syntax.
The description is forces you to use Distinct, but its wrong descigion.
Everyone literally hates this kata, but i found very interesting moment with explicit type casts.
It could be the pain in the ass, if you dont know, how deal with it on real database.
Yes, in description we should have a point about that we will have invalid zipcodes for input