Question

SO I have a table with 3 cols:

Col1   Col2   Col3
 a       b     c
 b       c    null
 a      null   b
 c       d     a

And my desired output will be:

a,b,c,d,null

I am hoping to have the output in a single string if possible.

I have tried:

SELECT DISTINCT col1, col2, col3 FROM table

and didn’t get the desired results. Any Ideas?

Answer 1

SELECT Col1
FROM table
UNION
SELECT Col2
FROM table
UNION
SELECT Col3
FROM table