I am using R 4.0.3 and sqldf 0.4-11.
I am running this code.
install.packages("sqldf")
library(sqldf)
table1 <- sqldf("select id, max(date)-min(date) as duration from dat group by id ")
Running was O.K. until the last Sunday.
But suddenly, it makes the error like following.
Fail to load extention and Error in !dbPreExists.
Can you tell me the cause of the problem?