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SELECT Hints, Tips, Tricks FROM Hugo Kornelis WHERE RDBMS = 'SQL Server' : What if null if null is null null null is null? 
In this fourth and final part in my series about NULL, I’ll discuss some well-known and some less well-known functions and keywords that are specifically created to deal with NULL values. And I will, of course, explain why null if null is null null n...
http://sqlblog.com/blogs/hugo_kornelis/archive/2007/09/
30/what-if-null-if-null-is-null-null-null-is-null.aspx
30/what-if-null-if-null-is-null-null-null-is-null.aspx
