Loading collection data...
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.
updated description:
That is a good remark. On the other hand, you are never restricted to plain SQL in a kata.
This comment is hidden because it contains spoiler information about the solution
error in the test is impossible because before approval kata is being solved by the smartest 2-1 Dan guys who detect all possible errors if they are there
It's already there: