Uninstall MySQL from Mac

Step1:

edit /etc/hostconfig and remove the line MYSQLCOM=-YES-

Step2:

sudo rm /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm /etc/my.cnf
sudo rm -rf /var/db/receipts/com.mysql.mysql*