How to “flatten” or “collapse” a 2D Excel table into 1D?

Question

I have a two dimensional table with countries and years in Excel. eg.

        1961        1962        1963        1964
USA      a           x            g           


        

Answer 1

In Excel 2013 need to follow next steps:

• select data and convert to table (Insert -> Table)
• call Query Editor for table (Power Query -> From Table)
• select columns that contain years
• in context menu select 'Unpivot Columns'-command.

Support Office: Unpivot columns (Power Query)