解决mysql数据库设置远程连接权限执行grant all privileges on *.* to 'root'@'%' identified by 

mysql数据库设置远程连接权限，执行grant all privileges on *.* to 'root'@'%' identified by '密码' with grant optio报错

ERROR1558 (HY000): Column count ofmysql.user is wrong. Expected 43, found 42. Created with MySQL 50556, now running 50639. Please use mysql_upgrade to fix this error.

解决办法:

使用命令：mysql_upgrade -u[username] -p[password]就可以解决。

使用mysql_upgrade对数据库的数据表结构等升级时，数据库引擎MyISAM 会做检查、修复的动作，InnoDB 执行 mysql_upgrade 没有作用。

查找MySQL的安装目录找到mysql_upgrade ：

• whereismysql_upgrade
• cd /usr/bin/
• ./mysql_upgrade -uroot -p123 (123为密码）

然后进入到mysql再执行权限修改即可：grant all privileges on *.* to 'root'@'%' identified by 'root4xml004a' with grant option;

如：

mysql中远程连接权限语句grant all privileges on *.* to ‘root‘@‘%‘ identified by ‘123456‘ with grant optio报错

grant all privileges on *.* to ‘root‘@‘%‘ identified by ‘123456‘ with grant optio

原因： mysql的版本问题，这条语句适用于MySQL8.0之前

解决： mysql8.0及以上版本需要使用以下语句：

create user root@'%' identified by '123456';
grant all privileges on *.* to root@'%' with grant option;