Vertically stack/concatenate columns with different row numbers into a single new column on the same data table
I have a data table with multiple columns (data imported from Excel).Each column has different number of rows items.I want to stack data from every column under each other in a newly created column.How to achieve this?(The stack sequence is not important as long as all data is there, but is column 1, column 2 ...column N is preferable)