Database Authority

CREATE USER 'username'@'host' IDENTIFIED BY 'password';
GRANT privileges ON databasename.tablename TO 'username'@'host'
REVOKE privilege ON databasename.tablename FROM 'username'@'host';
DROP USER ‘username’@'host’;
flush privileges;	最后不要忘记刷新数据库

创建用户
create user 'homestead'@'localhost' identified by 'YES';

授权
grant all on *.* to 'homestead'@'localhost';
GRANT SELECT, INSERT ON test.user TO 'pig'@'%'; 
GRANT ALL ON *.* TO 'pig'@'%';

设置与更改用户密码
SET PASSWORD FOR 'username'@'host' = PASSWORD('newpassword');

如果是当前登陆用户用
SET PASSWORD = PASSWORD("newpassword");

撤销用户权限
REVOKE SELECT ON *.* FROM 'pig'@'%';

删除用户