How do I get the count of null value columns per row in a return set?

Question

I\'m looking for a query which will return me an extra column at the end of my current query which is the count of all columns within the return set which contain a null column.

Answer 1

Ugly solution:

select Col1, Col2,
       case when Col1 is null then 1 else 0 end
     + case when Col2 is null then 1 else 0 end
     as Col3
from (

select 'A' as Col1, 'B' as Col2
union select 'A', NULL
union select NULL, NULL

) z

This returns

Col1 Col2 Col3
NULL NULL 2
A    NULL 1
A    B    0