Count of non-null columns in each row

Question

I have a table that contains 4 columns and in the 5th column I want to store the count of how many non-null columns there are out of the previous 4. For example:

Whe

Answer 1

SELECT   Column1,
         Column2,
         Column3,
         Column4,
         CASE WHEN Column1 IS NOT NULL THEN 1 ELSE 0 END + 
         CASE WHEN Column2 IS NOT NULL THEN 1 ELSE 0 END + 
         CASE WHEN Column3 IS NOT NULL THEN 1 ELSE 0 END + 
         CASE WHEN Column4 IS NOT NULL THEN 1 ELSE 0 END AS Column5
FROM     Table