Count the Null columns in a row in SQL

Question

I was wondering about the possibility to count the null columns of row in SQL, I have a table Customer that has nullable values, simply I want a query that return an int of

Answer 1

You don't state RDBMS. For SQL Server 2008...

SELECT CustomerId,
       (SELECT COUNT(*) - COUNT(C)
        FROM   (VALUES(CAST(Col1 AS SQL_VARIANT)),
                      (Col2),
                      /*....*/
                      (Col9),
                      (Col10)) T(C)) AS NumberOfNulls
FROM   Customer