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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.
Issue not specified properly.
Why not?
Maybe english is not your mother language (it isn't mine either) but that's what product means.
Weird, it's working fine for me and other 3790 persons on javascript, maybe post your code and mark your post as having spoiler content so we can check what's wrong with it?
If you are talking about SQL, read the post below, maybe it'll help you (but with the correct code it works too). I've modified the kata description to make more clear what's needed in SQL.
When reporting an issue, first, state what language you're talking about, and then give as much information as you can, it's easier to fix or help you that way.