T-SQL Where Clause Case Statement Optimization (optional parameters to StoredProc)

Question

I\'ve been battling this one for a while now. I have a stored proc that takes in 3 parameters that are used to filter. If a specific value is passed in, I want to filter on that

Answer 1

If you pass in a null value when you want everything, then you can write your where clause as

   Where colName = IsNull(@Paramater, ColName)  

This is basically same as your first method... it will work as long as the column itself is not nullable... Null values IN the column will mess it up slightly.

The only approach to speed it up is to add an index on the column being filtered on in the Where clause. Is there one already? If not, that will result in a dramatic improvement.