一般产生原因是手工更改my.ini的数据库文件存放地址导致的
mysql服务启动时候找不到内置数据库“mysql”，找不到那张表，就包了上述错误。
解决办法：将安装目录或之前的目录里面的“mysql”数据库拷贝到新的数据库文件存放目录即可
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