SQL - Fundamentals 3

The goal of this quest series is to improve your SQL skills
Goals
- Improve your SQL skills
Codewars Katas
You need to resolve this three Codewars Katas
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Adults only (SQL for Beginners #1)
SQL for Beginners #1
codewars.com
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On the Canadian Border (SQL for Beginners #2)
SQL for Beginners #2
codewars.com
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Register for the Party (SQL for Beginners #3)
SQL for Beginners #3
codewars.com
Challenge
Codewars Katas
Once you have completed the katas, you can validate this quest yourself.