mysql通过root账号登录，新建账户并授予权限会报错：
mysql> GRANT SELECT ON *.* TO 'select_user'@'%';
ERROR 1045 (28000): Access denied for user 'root'@'%' (using password: YES)
解决方案：
mysql> update mysql.user set Grant_priv='Y' where user = 'root' and host = '%';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
然后退出登录，重启mysql服务，之后就能正常授权了。
Reference
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