MySQL ERROR 3009 (HY000): Column count of mysql.user is wrong. Expected 45, found 42. Created with MySQL 50560, now running 50729. Please use mysql_upgrade to fix this error. - 码上快乐

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MySQL ERROR 3009 (HY000): Column count of mysql.user is wrong. Expected 45, found 42. Created with MySQL 50560, now running 50729. Please use mysql_upgrade to fix this error.

本文转载自查看原文 2020-02-29 20:55 945 错误异常处理

1.产生原因

在卸载原有的mysql5.5之后，安装了mysql5.7，进入数据库后，我发现原有的数据库都还在，但是在创建用户的时候报错

ERROR 3009 (HY000): Column count of mysql.user is wrong. Expected 45, found 42. Created with MySQL 50560, now running 50729. Please use mysql_upgrade to fix this error.

原因：错误是由于你曾经升级过数据库，升级完后没有使用 mysql_upgrade升级数据结构造成的。

解决办法：更新数据库

 mysql_upgrade -uroot -p

然后进入数据库，执行语句

这次没有报错

参考链接：

https://blog.csdn.net/m18994118189/article/details/83068242

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