原因：在使用sqldf时，不需要加载RMySQL库
解决方案：在控制台执行释放RMySQL库加载
detach("package:RMySQL", unload=T);
解决;R语言使用sqldf库是报错"Failed to connect to database: Error: Access denied for user '..'@'localhost' (using password: NO) Error in !dbPreExists : invalid argument type"
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