How to Optimize the Use of the “OR” Clause When Used with Parameters (SQL Server 2008)

Question

I wonder if there is any wise way to rewrite the following query so that the indexes on columns get used by optimizer?

Answer 1

MSSQL 2008 has optimization syntax of condition simplification, here it is

 Where (@key1 =0 OR Key1 =@Key1) AND
      (@key2 =0 OR Key2 =@Key2) option(recompile)

This will optimize usage of constants