MySQL重装报错
“The service already exists!，The current server installed:C:\mysql\mysql8.0.29\bin\mysqld MySQL”
原因：删除mysql，没有删除干净
解决方案：全程以管理员身份运行，否则报错：OpenService 失败 5: 拒绝访问
1.sc query mysql
2.sc delete mysql
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