原因：在使用sqldf時，不需要加載RMySQL庫
解決方案：在控制台執行釋放RMySQL庫加載
detach("package:RMySQL", unload=T);
解決;R語言使用sqldf庫是報錯"Failed to connect to database: Error: Access denied for user '..'@'localhost' (using password: NO) Error in !dbPreExists : invalid argument type"
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