CREATE USER 'test2'@'%' IDENTIFIED BY '123456';
GRANT ALL PRIVILEGES ON *.* TO 'test2'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
FLUSH PRIVILEGES;
delete from user where `user` = '';
drop user test2;
CREATE USER 'test2'@'%' IDENTIFIED BY '123456';
GRANT ALL PRIVILEGES ON *.* TO 'test2'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
FLUSH PRIVILEGES;
delete from user where `user` = '';
drop user test2;