@prasath17
Many thanks for this cross check I did update the statement
let mdt = grp.OrderBy(Function (x) CDate(x(1).toString)).Last()(1)
bold part was ommited - we want to fetch the col value.
Thanks for cross checking and enhancement
GroupBy_1Col_TakeLastMonth.xaml (7.5 KB)
the original data was without leading 0 in the month part but both are working