'How to read CSV file in R without losing data?

I'm importing CSV file to Rstudio. I use this command

df <- read.csv("C:/Users/Ibad/Desktop/corona.csv")

But I see there are many missing(NA) values in Rstudio. While when I open this file with SQL workbench or excel I don't read any missing values.

Thank you.

r read.csv

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