mysql -u root
　　mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');

mysqladmin -u root password "newpass"

mysqladmin -u root password oldpass "newpass"

mysql -u root
　　mysql> use mysql;
　　mysql> UPDATE user SET Password = PASSWORD('newpass') WHERE user = 'root';
　　mysql> FLUSH PRIVILEGES;

mysql>use mysql;

mysql> select host,user,password from user ;

mysql>use mysql;

mysql> select host,user,password from user ;

mysql> insert into mysql.user (Host,User,Password) Values('%','wise',PASSWORD('passwd'));
msyql>FLUSH RPIVILEGES

mysql>rename user feng to newuser；//mysql 5之后可以使用，之前需要使用update 更新user表

mysql>drop user newuser; //mysql5之前删除用户时必须先使用revoke 删除用户权限，然后删除用户，mysql5之后drop 命令可以删除用户的同时删除用户的相关权限

mysql> set password for zx_root =password('xxxxxx');
 mysql> update mysql.user set password=password('xxxx') where user='otheruser'

mysql> show grants for zx_root;

mysql> grant all privileges on YQ.* to wise;

mysql> revoke select on dmc_db.* from zx_root; //如果权限不存在会报错

mysql>rename user feng to newuser；//mysql 5之后可以使用，之前需要使用update 更新user表

mysql>dropuser newuser; //mysql5之前删除用户时必须先使用revoke 删除用户权限，然后删除用户，mysql5之后drop 命令可以删除用户的同时删除用户的相关权限

mysql> set password for zx_root =password('xxxxxx');
 mysql> update mysql.user set password=password('xxxx') where user='otheruser'

mysql> show grants for zx_root;

mysql> grant select on dmc_db.* to zx_root;

mysql> revoke select on dmc_db.* from zx_root; //如果权限不存在会报错