Nulls and the MERGE statement: I need to set a value to infinity. How?

Question

In SQL Server 2008, I\'m using MERGE. Everything is fine except that I have 2 nullable columns. If I pass a null value and the target isn\'t null, MERGE doesn\'t see a diffe

Answer 1

WHEN MATCHED AND
(
   NULLIF(tgt.C, src.C) IS NOT NULL OR NULLIF(src.C, tgt.C) IS NOT NULL
)
THEN