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.

Answer 2

Maybe you could use UNION :

SELECT Column1 FROM table UNION SELECT Column2 FROM table

Not sure to understand if that's what you want...

Answer 3

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;