How to merge excel files with two different schemas? For example, one type of excel file has 12 columns, whereas another type of excel has 15 columns, where 3 columns are added in the 9th column. I need to combine all the data of excel files with these 2 different schemas. When these files are combined, the first type of file which does not have the 3 columns, should show the data as blank. Instead, currently my workings are either considering the first type of schema, or i should ignore all the files which has first type of schema, which make me to work with lesser data. Any thoughts??