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.
On your last join statement, you have
id
instead ofschool_id
Are you sure? I'm bad at SQL, but if I try to just select 5 books I get the following error: