How do you uninstall MySQL from Mac OS X?

If you installed mysql through brew then we can use command to uninstall mysql.

$ brew uninstall mysql

Uninstalling /usr/local/Cellar/mysql/5.6.19...

This worked for me.

I also had entries in:

/Library/Receipts/InstallHistory.plist

that i had to delete.

Try running also

sudo rm -rf /var/db/receipts/com.mysql.*