TSQL Case in where statement if parameter is null

Question

I have a SP that gives me a lot of hard times.

The sp gets a two parameters @madeByUserId and @reportedByUserId. I want to have something like:

 select          


        

Answer 1

Add an if statement

IF (@reportedByUserId IS NOT NULL)

SELECT * FROM table t WHERE t.MadeByUserId = madeByUserId etc