SQL - Ludicrous 6

The goal of this quest series is to improve your SQL skills
Goals
- Improve your SQL skills
Codewars Katas
You need to resolve this two Codewars Katas
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SQLonacci sequence
codewars.com
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Counting overlapping events
codewars.com
Challenge
Codewars Katas
Once you have completed the katas, you can validate this quest yourself.