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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.
Slight improvement would be to add additional criteria on each join, to restrict the rows during the join
The subquery here is poor practice. Suprising this is getting best practice votes. The query forces creation of a full set of data which is then filtered on the 'outer' where. Consider these can be moved in to each query from ussales and eusales.
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