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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.
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What is meant by this, "anti-pattern"?
* just means fetch all columns in the table being searched. In this case it is the students table which also has an alias s. Hence why we have SELLECT s.*, which is referring to the alias s, which is the students table and the . says on students give me all the columns. In this case just the * would have worked .