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Q&A Merge a pair of columns where in each row one is blank, without a formula

A Q on Stack Overflow asks how to merge two columns where each row has only one populated cell. The example was from (on the left) to (on the right): a|b a 0| ...

0 answers  ·  posted 4y ago by pnuts‭  ·  last activity 3y ago by pnuts‭

Question excel merge
#1: Initial revision by user avatar pnuts‭ · 2020-10-18T11:44:38Z (about 4 years ago)
Merge a pair of columns where in each row one is blank, without a formula
A [Q](https://stackoverflow.com/questions/64188649/how-can-i-merge-two-columns-with-data-where-if-one-columns-cell-is-empty-the-ad) on Stack Overflow asks how to merge two columns where each row has only one populated cell. The example was from (on the left) to (on the right):

    a|b                     a  
    0|                      0  
    |1                      1  
    |5                      5  
    9|                      9  

Although the body included:

>How can I quickly merge columns a and b in this way in libreoffice calc?

The tag set included [excel] and the only A at present is stated to be for Excel (though it works in LibreOffice Calc also). That A suggests:

    =A1 & B1

in a new column and copied down.

In Excel, is there a way to avoid the need (i) for use of a third column, (ii) to copy down and (iii) a formula?