The DataTable.Select method doesn't support the BETWEEN operation. This operation is specific to a database engine. ... <看更多>

library(data.table) set.seed(1L) ## Create a data table DT ... select(DF, V2, V3, V4) select(DF, V2:V4) # select columns between V2 and V4 ... <看更多>

... <看更多>

is.na() ! &. %between% dt[, c(2)] – extract columns by number. Prefix column numbers with “-” to drop. dt[, .(b, c)] – extract columns by name. ... <看更多>

In order to distinguish between them, I'm checking if the length of my selected items is greater than zero and I behave accordingly. The ... ... <看更多>