Is it possible to ignore NULL values when using LAG() and LEAD() functions in SQL Server?

Question

As you know the LAG() & LEAD() analytic functions access data from a previous and next row in the same result set without the use of a self-join. But is it possible to i

Answer 1

LEAD(IIF(col1 IS NULL,NULL, col1),1) OVER PARTITION BY (ISNULL(col1))