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

I would advice to do this using php or some script but not using mysql. Still, you can achieve this with mysql like this:

SELECT t1.Column1 FROM table as t1
UNION
SELECT t2.Column2 as column1 FROM table as t2 ORDER BY Column1;