Query Performance with NULL

Question

I would like to know about how NULL values affect query performance in SQL Server 2005.

I have a table similar to this (simplified):

ID | ImportantDa         


        

Answer 1

The alternative is to normalize QuickPickOrder into a table with a foreign key, and then perform an inner join to filter the nulls out (or a left join with a where clause to filter the non-nulls out).