How to combine two columns info and remove redundant info?

[#1]

Hi I want to get some advice of combining columns. 

Here I have column 1 and 2 and these two columns are actually containing the same info of interest. I want to combine them together and remove repeat info. 

Original table: 

Column1 Column2

     1              1

     2          

     3              3

Final table: 

Column

1     

2          

3        

Thank you! 

[#2]

If they are always same, you can create new column which is some summary statistic of those columns (min, max, mean, median,...)

Then delete the formula from new column and rename it

And then remove old columns if you want to