How to merge two columns in sql and display it into a separate record

Question

I have this table

Column1|Column2
1       2
3       4

I want to merge two columns and make them appear like this

 NewColumn
 1         


        

Answer 1

The keyword you're looking for is UNION:

SELECT column 1 AS newColumn
FROM...
UNION
SELECT column2 AS newColumn
FROM...
ORDER BY newColumn

This of course gets unwieldy if you need to combine multiple columns - ideally avoid having to do it by storing data as raw as possible and aggregating instead.