MySQL does not start when upgrading OSX to Yosemite or El Capitan

Question

I know similar questions exist, such as MySQL with MAMP does not work with OSX Yosemite 10.10. However, I do have MAMP, nor XAMPP installed on my computer.

When I tr

Answer 1

2 steps solved my problem:

1) Delete "/Library/LaunchDaemons/com.mysql.mysql.plist"

2) Restart Yosemite