What does the below R code do? Also I am looking to convert R code to sql statement [closed]

I have the following R code:

df2 <- df1 %>% group_by(MLT_ID_RD,MIS_MON) %>% filter(UPDATED_AT_RD==max(UPDATED_AT_RD))

Can someone explain what the above code is doing exactly?

Also, I am looking to convert the above code to mysql. Any help is much appreciated!

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